TuneUp Utilities 2012
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Full user review
Does its job fairly well, though I don't know if there was much difference in the speed of the computer after running this. I wasn't able to see much of a difference.
Gets very irritating after the trial period ends. Even if you don't want to use it, it pops up every once in a while, bugging you to buy the product.
Don't waste your time. It's not cheap, and there are other free software which will do the job just as well for you.