Great PC Helpers

This thread will be for posting PC fixing tools such as de-fragmenting or registry tools.
Please feel free to post whatever tools you think are great (with a link if possible) and why. Thanks.

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I use two great, free, tools to keep my PC running at full potential

The first is CCleaner which is an advanced version of the Disk Cleaner ( Cleans way more efficiently) and it also check and fixes registry errors.

Download - http://www.piriform.com/ccleaner

The other is Defraggler which is a good defrag tool that is made by the same company that made CCleaner.

Download - http://www.piriform.com/defraggler

I use exactly the same as well as registry mechanic.

http://www.pctools.com/registry-mechanic/

Its not free but its worth it. Just makes your computer that little bit faster and most likely never to implode.