We need more detail than you have given.
1. What make/model computer?
2. What is the Operating System (XP Home, XP Pro, or what)?
3. What have you done so far and what else, apart from the display, was/is wrong that you want to restore to earlier time?
4. Do you have a CD with the O/S (operating system) on?
5. Do you have the motherboard drivers?
6. Is the video/graphics onboard (built into your motherboard) or on a separate card plugged into the motherboard?