How to Sign File System Drivers for Release
Kernel-mode driver binaries for 64-bit versions of Windows Server 2008 and Windows Vista must be signed for release, or Windows will not load the binary. This requirement applies to file system drivers, including minifilters, legacy filters, and redirectors. For details and links to resources, including slides and a video presentation on file system driver signing, see How to Release-Sign File System Drivers, available on WHDC.
Karlito Bonnevie [MSFT], WDK Technical Writer
http://blogs.msdn.com/wdkdocs
This posting is provided "AS IS" with no warranties, and confers no rights.