Problem with filterdriver

Lately I received from MS a filter driver (patch for missing functionality
for ‘VaryingResourceMap’ in W2k ).
When I try to install this filterdriver I always get errormessage : This
device is not working
properly because Windows cannot load the drivers required for the device
(code 31).
This indicates a problem with the drivers AddDevice or
driverentry-function.
When I try to debug the filter driver (I added debugmessage -KDPrint- in
AddDevice of driver) I don’t see any messages in WinDbg.
Since I’m not so familiar with debugging drivers : is it possible to debug
filter driver?

Where do I need to seek for the problem : in filter driver, supplied inf
files??
Can there be other reasons for this failure??
Thanks for any help,suggestion.