Quick tip of the day. If you want to install Google Desktop on Vista 64 bit do as follows:
1. Click Start menu -> Run or tap Windows sign and “r” at once on keyboard.
2. Type “cmd” and press Enter.
3. Navigate to folder which contains GoogleDesktopSetup.exe (Google Desktop installer).
4. Type GoogleDesktopSetup.exe /force
That’s it! Your installation was just started, proceed with the wizard to setup application. Enjoy!
Now Google Desktop supports 64bit operating systems! Read here.