Hi all
If you need to "Clean yur Registry" I'd advise a new OS install - especially for W7 -- a good idea now RTM is near to get rid of all the old garbage in your systems and perform a nice clean install.
I've been using Windows since Windows 3.0 days and can honestly say that I've only ever had to mess around with the registry about 6 times - and then only to get a recalcitrant machine into "administrator mode".
If you BACKUP before installing any complicated piece of software you can RESTORE if the software doesn't perform as expected.
I find this far better than relying on the "Uninstall" feature provided with some programs as invariably they leave some junk behind in the registry.
using a program like Acronis it only takes typically around 15 - 20 mins to backup an entire W7 partition.
Cheers
jimbo