Microsoft's cross-platform preview version of Windows Defender, known as Microsoft Defender Preview, is now live: an attractive way to protect your Android phone as well as your PC.

If you merely own a Windows 11 PC, there's nothing that demands you download Microsoft's new preview app. It's quite different, however, if you own an Android phone in addition to your PC. We'd recommend that you try out this attractive, free utility that promises to watch over the files you download on your phone as well as the links you access. (Defender Preview will supposedly protect Macs, as well, though we haven't tested or confirmed this.)

There is a small catch, however: You'll need a Microsoft account to use the Microsoft Defender Preview, and it will only protect a total of four devices.

Mark Hachman / IDG

WindowsLatest noticed that the app page for the Microsoft Defender Preview app is now live—both on the Microsoft Store, as well as for Google Play. (Though the Microsoft Defender Preview Store listing was live as of January, the service itself was inactive. That's now changed.) You're best served by installing the app on both your Android phone/tablet and your PC, as Defender provides you an overview of how it's protecting all of your devices.

From a PC perspective, Microsoft Defender Preview doesn't appear to do anything materially different from the Windows Defender that's already on your PC. In fact, Microsoft Defender simply cleans up the “Virus and Threat Detection” dashboard from the Windows Security portion of Windows Defender and presents it in a modern, Windows 11-ish style. (Pulling out and cleaning up portions of Windows and repurposing them in other portions of Windows seems to be fairly common these days.) We don't know, however, if Microsoft Defender will eventually replace Windows Security.

On a phone, at least, Microsoft Defender is much more straightforward. Yes, Google and Android work behind the scenes to protect your phone, but Microsoft Defender works to soothe that portion of your brain that seeks visible proof that your phone is being protected. Microsoft Defender sniffs links that you access on your phone to ensure you're not downloading malware, and also investigates any apps already on your phone to ensure that they're not known to harbor malware. Naturally, if it finds anything, it will pop up a notification.

Mark Hachman / IDG

Microsoft Defender will ask for permission to access the “Accessibility Services” permission of your Android device, which gives Defender that leeway to examine links and apps. It will also require you to manually toggle the permission switch, something you may not be accustomed to doing. Scans will take place periodically, which will cut down on battery life—but how much, we can't say. It might be worthwhile to check your Android settings to determine how many resources Defender is consuming.

Microsoft Defender doesn't seem to be a tool that responsible PC and Android users would necessarily need. But for those pre-teens and teens who have been given a phone to remain in contact with their parents (and may then decide to download apps willy-nilly), Defender seems like a decent safety blanket to ensure they're not downloading a risky app that could end up stealing their data.

There's a reason that unboxing videos and the phrase “new car smell” are firmly ensconced in the public groupmind. New stuff is exciting! New stuff is (theoretically) better! New stuff is just plain cool.

But new stuff also costs an arm and a leg—at least if you're talking about a new PC. And you might not even truly need a new PC to accomplish what you're looking to do, because most everyday tasks don't require much processing power, especially now that so many services have moved onto the web.

Fortunately, there are a slew of ways to breathe new life into an older PC that's starting to feel a little pokey. Even better: Most are outright free, a couple of (still relatively low-cost) hardware upgrades aside. Sure, these tweaks and tips aren't as thrilling as booting up a brand new PC for the first time—but they'll let you continue to get the job done with the gear you already have. Try them before you invest in some shockingly cheap PC upgrades or even a whole new laptop.

Streamline your startup

Let's start with the simpler things first. If your computer is chugging, too much software booting at system start may just be to blame. Before you take more drastic measures, clean up your startup by opening the Startup tab of Windows 10 or 11's Task Manager, or typing “msconfig”—minus the quotation marks—in Windows 7 and opening its Startup tab.

While you don't want to disable Windows processes, or processes related to your hardware, ruthlessly eliminate anything else that you can identify if at all possible. You wouldn't want to prevent your antivirus from launching at startup, but there's no reason for Steam or Adobe Reader to hog your system resources except for when you explicitly need them. Windows helpfully tells you how much of an impact each program has on your startup time. Take out any High-impact, non-essential programs first, then move down the list from there.

Spring cleaning pt. 1

If cutting back your boot programs doesn't do the trick, it's time to try some deeper cleaning. Eradicate any programs you don't actually use—PC makers stuff computers full of bloatware. Search for “Add or remove programs” in the Windows search box and work through the list of installed programs.

The best overall antivirus

Norton 360 Deluxe

Read our review

MSRP: $99.99

Best Prices Today: $9.99 at PCWorld Software Store | $29.99 at Amazon | $35 at Norton

Run a security sweep while you're at it, in case malware is slowing down your system. PCWorld's guide to the best antivirus suites can help, but the Windows Security tool built right into Windows 10 and 11 does a surprisingly good job at eradicating threats. Don't bother defragmenting your storage. You shouldn't even defrag SSDs, and if you have a traditional spinning hard drive, most modern operating systems perform the task automatically.

Spring cleaning pt 2

Scrub your hardware while you're busy scrubbing all that unwanted software, too. Ideally, you want to clean out the interior of your PC once per year, but let's be honest—most people never pry open their case and blow out the dust bunny horde. Over time, the accumulated gunk can wreak havoc with temperatures inside your PC, which in turn makes your PC components either throttle back performance to compensate for the increased temperatures, or just plain struggle.

No joke: Once a family member called me over because his PC was sluggish and unresponsive. Merely cleaning out the inches of dust inside his machine made the system run like new. Check out PCWorld's guide to PC cleaning before cracking open your case. (Why not clean your keyboard while you're at it, too? It can get gnarly under those buttons.)

Reinstall Windows

Still running slow? We're running out of pure software optimization tricks now. Windows is notorious for slowing down over time. If you've never refreshed your PC with a fresh Windows install, now's the time to do it.

Back up all your critical system data, either by cobbling together native Windows tools or investing in a comprehensive Windows backup program (our current favorite is the superb Acronis True Image 2021). Make sure you have your Windows product key in hand—Belarc Advisor can help if need be—and follow this guide to slap a fresh, factory-new copy of Windows on your computer. (The article's a few years old, but the info's still good.) Be warned: If you're using a manufacturer-supplied recovery disk, you'll need to clean all the preinstalled bloatware off your machine after reinstalling Windows.

Overclock! (Or undervolt)

Don't have money for new gear? Overclocking—using software to manually speed up the clock speeds of your hardware—lets you get more out of what you already have, though most laptops lock down the capability. Assuming your desktop PC has proper cooling and a CPU that's capable of overclocking (Intel limits it to chips with a “K” designator at the end), boosting your processor and graphics card's clock speeds can have a noticeable effect on your PC's performance.

Boosting your computer processor is a manual endeavor, and our guide to overclocking your CPU can walk you through each step. It's easier on modern GeForce and Radeon graphics cards. You can choose to apply an automatic overclock to your GPU in the Wattman section of AMD's Radeon Settings tool, and Nvidia's GeForce Experience software offers an auto-overclocking feature of its own. If your software doesn't, or if you want to push your overclocks to the furthest possible limits (as auto-OC tools tend to be conservative), our guide to overclocking your graphics card manually can help.

Alternatively, if your older graphics card is running hot in your system, undervolting it could be the key to taming it, and keeping it happy for months to come. Our guide to undervolting pros and cons walks through why you should (or shouldn't) reduce the juice to your GPU.

Install an SSD

If your computer's still feeling crippled after all the software tricks, you have a couple of different options: Change out some hardware, or completely alter how you use your PC. Let's dig into the former first.

The best ssd for most people

SK Hynix Gold S31 SATA SSD

Read our review

MSRP: $118.99

Best Prices Today: $92.99 at Amazon

When it comes to pure performance, upgrading from a traditional hard drive to a solid-state drive is like trading in your Volkswagon Beetle for a Ferrari. Seriously: Upgrading to an SSD will utterly blow you away, supercharging everything from boot times to application launches to file transfers. This is the single most noticeable PC upgrade most people can make. An SSD can make even a clunky old laptop feel comparatively snappy, and you can find all sorts of drives going for around 10 cents per gig these days, so you can get a 500GB drive for roughly $50 to $60 if you shop around.

Pretty much any SSD will smoke even the fastest hard drives, but our roundup of the best SSDs can guide you towards the best options. We have a guide to installing an SSD in your laptop, too.

Add more RAM

Windows 10 has an impressively small footprint, but if you're running a computer with less than 8GB of RAM, it can negatively affect your performance in other ways. Memory-constrained systems are slower at gaming, slower at booting up, and can start to choke if you begin to multitask heavily (including having too many browser tabs open at once). Adding more RAM can help. You'll want to completely replace the memory in your system if you're upgrading to avoid potential conflicts, but an 8GB memory module (or an 8GB kit of two 4GB modules) can often been found for under $50 at basic speeds.

Upgrading your desktop memory is easy: Just pop out the sticks located in the slots next to the CPU in your motherboard, then swap in the new ones. Be sure you've chosen the right RAM type first, though. Notebooks can be trickier. Check out our guide to upgrading your laptop's RAM if you need help.

Switch to Linux

Sometimes it's just not worth putting new hardware into an old PC. But that doesn't make it useless! If you still need to use your aging laptop or desktop as an day-to-day actual computer, installing an operating system with a lighter footprint than Windows can help you eke more life out of an aging PC.

Linux tends to run better than Windows on less potent hardware. In fact, several Linux variants are specifically designed with ultra-minimalist requirements so they're able to run on old PCs—Puppy Linux, LXLE, and Lubuntu come to mind immediately. The transition from Windows to Linux isn't as rough as it used to be, but you'll still want to check out our beginner's guide to Linux, including the software recommendations on the last page.

Embrace cloud gaming

Linux isn't the only way you can repurpose a computer. Rather than using a pokey PC as a traditional do-it-all machine, consider giving your system a singular role if you have another PC you can use as your primary rig. Let's look at some ways you can make obsolete computers purposeful once again.

If you're a gamer, the easiest option for an old laptop is simply to use it to game while you're away from your main gaming rig. “But Brad!” I hear you wailing. “You can't game on an old PC!” Ah, but you can with a decent Internet connection. After years of teasing, the promise of cloud gaming's finally coming true, letting even the most humble computers get in on the action by streaming your gameplay from far-away servers, Netflix-style. Nvidia's GeForce Now is the best bet for PC gamers, as you BYO games by linking your existing accounts to various platforms. Better yet, there's a surprisingly full-featured free tier, as well as a killer RTX 3080 tier that unlocks top-shelf hardware, longer session times, and ultra-fast refresh rates on compatible displays and devices at $99 for six months. Check out our guide to whether GeForce Now is worth it if you have any questions.

Microsoft's killer Xbox Game Pass Ultimate also unlocks game streaming to a vast library of games as part of its $15 per month fee, though you'll be streaming the Xbox versions of those games on your PC. Here's how to get Xbox Game Pass Ultimate for cheap if you want it. Other options (like Google Stadia and Amazon Luna) exist but they're less attractive, especially to PC gamers.

And there's always Steam in-home streaming if you want to use an older PC as a secondary gaming computer. Steam in-home streaming runs games on your beefy gaming rig, but beams them over your home's Wi-Fi network so you can play them on other devices. It's like cloud gaming, but right inside your home.

Fling some files

Speaking of repurposing your hardware, two common uses are to transform an old PC into a dedicated home theater PC or a file server.

It's not even that hard to do, though obviously it means your PC's email and Office days are over. Some awesome free software available for each use: Snag MediaPortal, OpenELEC, or Kodi (the new name for the uber-popular OS formerly known as XBMC) for a would-be HTPC or FreeNAS to build out a badass home server.

Bite the bullet

Sometimes, though, a system is just too far gone to be of practical use. If your old dog needs to be brought behind the shed, we can help you find a new computer. Our guides to the best laptops in general, the best laptops for college students, and the best fire-breathing gaming laptops can help point you in the right direction for your needs.