I had exactly the same problem as you and I used the registry edit to fix it. It fixed it but Disk Cleanup no longer scanned for 'compress old files'. I'm pretty sure that installing SP2 fixed it for me - i.e. it then started scanning for 'compress old files' again and didn't freeze. I don't really think it is 'an issue' unless you are desperately short of disk space or you like seeing foles in blue in Windows Explorer.