From The Register:

Installing tune-up and registry fixing software was hit and miss when we tested on a five-year-old Windows XP laptop. Faster Microsoft Office and Windows boot-up times were possible with some software packages, but occasionally performance took a dive and a similarly priced Ram upgrade thrashed the rest of the field.

This time - in the second of our three-part investigation; we'll be looking at Windows 7 in due course - we’ve tested the same five tune-up applications on a newer, faster computer. There's a caveat: this computer runs Vista. That makes start-up time much slower than on the old XP laptop and the potential benefit of tune-up software greater.

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