CL wroteI think, this version is not tested. I hope, that have macecraft a better version in a half year.
Well, if you have a look under "Development => Beta testing" you will see that PT 2006 has been tested by the best testers there are - critical users.
And if you have a look here in "Tullik's report"http://www.macecraft.com/phpBB2/viewtopic.php?t=1207
you will see that there are not much problems with Registry Cleaner anymore.
So it may be the problem you encounter is in relation to your configuration, and therefor you should give more details about this and may be also the options you checked, or a screenshot about what the RC-window is showing.
How long did you wait when it seems that "nothing goes"? Can't you see anymore activity in Windows Task Manager?
Jean-Paul