If you are running the Windows 7 Beta and have turned User Account Control (UAC) completely off, you may have noticed that the desktop gadgets no longer work. Turn UAC back on, even at a minimum level, and they start working again. Want to have them work all the time? Just add this little registry hack:
[hkey_local_machine\software\microsoft\windows\curentversion\sidebar\settings]No need to restart your machine, just run the desktop gadget gallery and your gadgets will magically reappear.