Final answer:
To resolve a Windows startup issue caused by a problematic video driver, booting into Safe Mode and rolling back or updating the driver is the best first step.
Step-by-step explanation:
If a new video driver is causing Windows to fail to start, booting into Safe Mode is often the best first step to correct the issue. Safe Mode loads Windows with a limited set of files and drivers, which often excludes the problematic video driver. Once in Safe Mode, you can roll back the driver, update to a different one, or uninstall it, which should help you resolve the issue.