Installed graphics card, computer slows to a halt after start up.
Just replaced my old graphics card with a new one, removing the drivers beforehand. After loading the computer back up after installing the new graphics card, problems occurred. The system ran fine for about 5 minutes or less. Then the computer slows down gradually to a complete halt. Tried removing the drivers again and installing previous graphics card. But the problem still persists. What do you think the problem is?