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#11
Win 7 does not need a registry cleaner. Forget all the "wisdom" you learned about XP. Win 7 is not XP and does not manage the registry the same as XP.
Win 7 is much more efficient at managing the registry. If you are very knowledgable of the registry, you can use Ccleaner to delete keys left over when uninstalling programs. However, these few keys will not make 1 millisecond's difference in performance. If you run Ccleaner or any other registry cleaner and do not know precisely what you are doing, you will have problems down the road. There are no gains to be had from using a registry cleaner and the risk is great.