For those encountering problems with the Vista Sidebar loading and gadgets disappearing:
- Open a Command Prompt as an Administrator.
- Enter these commands, pressing Enter after each line:
Regsvr32 atl.dll
Regsvr32 “%ProgramFiles%\Windows Sidebar\sbdrop.dll”
Regsvr32 “%ProgramFiles%\Windows Sidebar\wlsrvc.dll”