Round up: Speed up Windows with the best free PC optimization software 2016

Speed up your PC

Remove junk files and tune up your PC

A PC or Mac is rather like a car. That showroom-fresh saloon doesn't seem so sleek and shiny once road film, suicidal insects and evil supermarket car park users start ruining it, and that speedy new computer soon begins to sag under the stress of unnecessary apps, unwanted add-ons and other irritations. Thank crikey, then, for system utilities and tools: the right ones make your PC or Mac feel brand new, or at least an awful lot faster and a lot less crashy.

There are thousands of system utilities out there, but these are our favourites - although as with any freeware, be very careful when you're installing any of them. Many free apps' installers are awfully keen on giving you extra software, toolbars or changes to your search engine that you might not want - see our guide to avoiding potentially unwanted programs.

1. CCleaner

Remove unneeded files for a quick and easy speed boost

CCleaner has been around for a long time, and part of the reason for its ongoing popularity is that it cleans the parts of your PC that many other free apps don't.

There are paid-for versions that add real time protection and cleanup scheduling, but the free edition covers the important stuff such as removing temporary files, getting rid of browser caches, removing unwanted cookies while keeping the useful ones and so on.

If your PC feels slow or sluggish then this is the app to try first, and is our favorite free system tool.

Have we missed a program you rely on to keep your PC in top shape? Let us know in the comments below.

2. PC Decrapifier

Uninstall the junk programs that come with a new PC

Like CCleaner, PC Decrapifier's job is to remove unnecessary files and programs for your PC. It's particularly useful on brand new PCs, which are often either full of exciting opportunities to discover new apps or stuffed to the gills with a load of preinstalled junk, depending on your point of view.

PC Decrapifier analyses your system, shows you the apps it thinks you should get rid of - based not just on its developers' opinions but on other users' feedback - and then removes the ones you choose. It's so focused on cleaning PCs it doesn't even install itself.

3. Autoruns

Stop unnecessary startup processes to speed up boot times

We don't normally quote former US Secretary of Defense Donald Rumsfeld, but when he said "There are known knowns. These are things that we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know," he could have been describing the apps you know you're running - the known knowns - and the ones you don't.

Those apps run when you boot Windows, or login, or launch certain system apps. You can find and get rid of the known unknowns and the unknown unknowns with the superb Autoruns.

4. Recuva

An essential tool for recovering lost or accidentally deleted data

There are lots of data recovery tools out there, but Recuva is our favorite. Not only can it recover files that have been deleted but not overwritten, but it can recover files from removable media such as USB drives and memory cards. It can even get data off damaged discs, although naturally the success rate depends on the kind and extent of the damage.

The paid-for Pro version adds support for virtual hard disks and offers technical support too, but the free one is worth sticking on a thumb drive as part of your emergency toolkit.

5. 3DP Chip

A convenient tool to keep your hardware drivers up to date

The near-infinite variety of possible Windows PC configurations is a great thing, but it can also lead to a great big pain in the backside: ensuring that the device drivers, the bits of software that Windows uses to communicate with your various bits of hardware, remain up to date. It's worth doing because driver updates banish bugs, vanquish vulnerabilities and fix flaws, but it's not remotely quick or fun.

Enter 3DP Chip, which can do the dirty work for you - and unlike some other driver update programs, it doesn't try to install a whole bunch of nonsense on your PC either.

6. SpaceSniffer

Find out what's taking up so much space on your hard drive or SSD

You're running out of space but you've no idea why. Does that sound familiar? Then you need SpaceSniffer, which enables you to see what's taking up space via a format known as a Treemap.

It's a very immediate way to understand where the space hogs are on your system, and the filtering means you can limit the visualisation to certain kinds of files or to exclude certain kinds of files. You can also combine filters to look for space hogs of a particular kind or vintage.

7. Auslogics Duplicate File Finder

Delete redundant files to free up space on your hard drive or SSD

One of the downsides of digital media is that it's very easy to end up with multiple copies of the same thing taking up valuable storage space. That's bad enough on a hard disk, but on the more limited space of an SSD it's even more of a problem - or at least, it is if you don't have Auslogics Duplicate File Finder.

It scans your PC for duplicate files and enables you to restrict the search to specific file types or sizes, and you can specify whether duplicates should be binned or placed in a holding area for you to check them out. This is a great and genuinely useful app for Windows users of all kinds.

8. Revo Uninstaller Free

Remove all traces of uninstalled programs to avoid junk buildup

If you like trying new apps you'll be horribly familiar with the joys of the Windows Uninstaller, where all too often uninstalling a program leaves bits and pieces everywhere. It's a particular pain when an app installs other apps such as browser toolbars and unwanted helper apps.

Revo Uninstaller Free can solve that problem by scanning for the bits the standard uninstaller often leaves behind, and its multiple uninstall option means it's a big time saver too. The free version can't uninstall apps that were on your PC before you installed it, but it does a good job of getting shot of anything added since.

9. Secunia Personal Software Inspector (PSI)

Keep your software up to date with the latest bug fixes and security patches

Secunia PSI solves one of the biggest headaches for Windows users: keeping software up to date in order to keep your system secure. The app knows about thousands of different programs and can scan your system to identify whether you have the most up to date versions.

And here's the best bit: if you don't, it can usually download and install the necessary updates and/or patches without any further intervention from you. The combination of PSI and Windows Update should ensure that malware can't exploit any vulnerabilities in unpatched software.

10. OnyX

A system cleanup tool to keep Macs running quickly and smoothly

The majority of system tune-up and cleaning apps are for Windows, but Macs get messy too - and on OS X, the evergreen OnyX is often the solution. It can get shot of bulging system logs and clean up files that are no longer needed, it can turn on hidden features in OS X itself and you can use it to schedule dull but useful maintenance tasks.

It has two companion apps, both also free: Deeper is purely for personalisation while Maintenance covers - yep - maintenance. For most people OnyX offers the best of both.

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