Debugging a Bugcheck 0x109

I want to share with you a recent experience where 64-bit Windows Server 2008 servers at a customer location were encountering bugcheck 0x109 blue screen crashes. In 64-bit versions of the Windows kernel PatchGuard is present. If any driver or application attempts to modify the kernel the PatchGuard will generate the bugcheck (CRITICAL_STRUCTURE_CORRUPTION) mentioned below. PatchGuard protects