srv.sys BSOD...What do I do?

I did a System Restore to the last driver I installed to try and correct
this error:

0x000000D1 (0x81E1383F, 0x000000FF, 0x00000000, 0xC8FE29BF)

DRIVER_IRQL_NOT_EQUAL_OR_LESS

When the computer restarted, it went into yet another BSOD:

srv.sys

The driver is attempting to access memory after it has been freed.

0x000000D5 (0xA6DE4E01, 0x00000000, 0xA853FF22, 0x00000000)

srv.sys - Address A853FF22 base at A851A000, DateStamp 4549acfb

It seems the srv.sys is the problem here? Do I have to replace the file?