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The performance of the PC Tools Performance Toolkit in Windows is good because it did not cause problems after allowing it to scan and repair what it finds. The privacy cleaning is not impressive though, because it failed to remove some temporary Internet files and search history in the Opera browser.
The test system in this PC Tools Performance Toolkit 2011 review has the Diskeeper program that automatically defrags the system. The PC Tools Performance Toolkit failed to detect that my hard disk does not require a hard disk defrag anymore. I also tested the defrag detection of Windows Live OneCare Safety Scanner, which was able to detect that my computer did not require a defrag.
The detection of the PC Tools registry cleaner for invalid and missing registry entries is correct and it was able to save around 3 MB of hard-disk space when I compacted the registry using its registry defragmenter.
I like its option to recover accidentally deleted photos or file and it works like a charm when I tested the feature. I deleted some test files and was able to recover them using the PC Tools File Recoverer that is included in the program.