If you are having problems with lockups, blue screens, or can only get to safe mode, often the problem is due to a faulty device driver.
One way to help identify them is through the use of the Verfier program
1. Start / Run / Verifier
2. Keep the default of Create Standard Settings
3. Select the type of drivers you want to confirm
4. A list of drivers to be verified on the next boot will be shown.
5. Reboot
6. If your computer stops with a blue screen, you should get an error message
with the problem driver
7. To turn off the Verifier, run verifier /reset