(This utility can list kernel mode filters and also unregister them. Monitored filters are, for instance, registry filters, create process and thread notifications. FilterMon comes both for x64 and x86 and it should work on all Windows systems from Vista RTM to Windows 7 RTM. However, I only tested it on Windows 7 RTM on x64 and I can't guarantee that it will work on future versions of Windows as it relies heavily on system internals.)