Microsoft driver verifier is a tool to help detect bugs in 3rd party drivers. It turns on a lot of error checking and forces a bug check when it detects a driver doing something incorrectly. It is a very useful tool when you have a problem like kernel memory corruption that is not caused by actual RAM problems or settings.
the risk in running it will be that it might detect a problem quickly and go into a bugcheck before the system has completed booting. Many people just don't know how to deal with that and end up reinstalling windows and blaming the tool. What you really need to know is how to boot into safe mode so you can turn verifier off with the
verifier.exe /reset
command then you can boot normally, look at the crash...