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#31
Why blame CCleaner if it could have been Revo, which is much more likely?
CCleaner will not touch an active Reg key while Revo lets you choose from a list but only the bolded items are safe.
Revo does set a restore point you can use to recover if necessary.
The problem with Revo is that it is easy to select a Registry Item that isn't in bold. Better to use Moderate than Pro unless you are really viglant as it uses a Safe Mode that makes this harder.