[intelliot]

Google Desktop Search cannot currently be installed over a network. Each
installation of Desktop Search is located on just one computer, so a
search from one computer won't find files which are located on another
computer on the same network.

That said, even though Desktop Search doesn't search all your network
drives, it does search files you've already seen. If you view a file
located on a network drive, that file will be indexed by Desktop Search
and may appear in your results.

Regards,
The Google Team