Windows 7 has tightened up its security by refusing to run gadgets if UAC has been turned off, so limiting the damage malicious unsigned gadgets can do to your system. If you've disabled UAC, miss your gadgets and are happy to accept the security risk, though, there's an easy Registry way to get everything back to normal. Run REGEDIT, go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Sidebar\Settings, create a new DWORD value called AllowElevatedProcess and set it to 1. Your gadgets should start working again right away.