Are there some utilities available from Microsoft that can provide diagnostic information about what drivers have been loaded into Windows, and whether they're user-mode or kernel-mode drivers, whether they're signed, etc. ? Thanks.

MSINFO32.EXE will do this for you to a certain extent. You can also use DRIVERQUERY.EXE from the command-line, see the /? help on that for displaying signed driver info. Ned Pyle [MSFT] - MS Enterprise Platforms Support - Beta Team