I downloaded and tried a freeware program the other day called tweeknow Power pack 2009. Packed full of utilities such as Registry cleaner , Registry defragmenter, track cleaner and more. Considering that most registry cleaners / defragmenters are around 29 us dollars or more to purchase this in itself makes this utility suite a great download. It also contains tweaks for windows xp, vista and windows 7. So far all the tweaks seem to be safe and hasn’t caused any problems on my system which is running Windows 7 64 bit.
So if your looking for a free Tweak,Registry and disk utility this would be one I would suggest you try.
you can get it from http://www.tweeknow.com