WinUtilities Free Edition
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Full user review
"Excellent utility for Windows xp"
Intuitive, comprehensive, effective, and FREE. If you use this with ccleaner and a good anti-virus package, you will be well protected.
Does not always clean every registry error, but still does a very good job.
This program, with its many useful component tools, is as good a PC cleaner as others that charge full price. And it works just as well as they do.