Ashampoo WinOptimizer 8
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Full user review
After using it I actually noticed a difference in my machine. I cannot say that for a lot of other products out there.
None yet accept my own fault with letting it install a tool bar, but that was only a 1 minute fix.
Good product. Too bad some out there felt misled. Your low ratings seem to be about your own hasty decision when you see the word "free" and not the actual product.