Vista comes with two versions of the Driver Verifier Manager — a command line version and a GUI version. Once enabled, the Driver Verifier Manager will go to work in the background and will essentially perform a series of extreme stress tests on the selected driver(s) in an attempt to cause the driver(s) to fail. Keep in mind that the tests that Driver Verifier Manager performs will occur as you use your system over time under normal circumstances. As such, it may take some time to identify a problem, if there is one at all. In other words, this utility will not yield immediate results.
If the driver does fail, it will cause a BSOD and a Stop error message that will contain information that you can use to determine and eliminate the problematic driver. If after a few days, the driver doesn’t fail and cause a BSOD, then the driver may not be the cause of the problem. Either way, you will have to disable the Driver Verifier Manager once you are done troubleshooting.