Reboot pc, and hit ur key that enables you to go into bios, should say when it is posting, :hit this key to go into bios or setup:. mine is f1, "it depends on what key it is becuase there are different bios's". In advanced tab there should be an option to enable AGP. once u found it and enabled it save and reboot and see if ur card works.
To get into safe mode, Reboot and hit F8 repeatedly and a DOS menu will come up and select Safe mode. Once windows loads it will ask u if u wanna do a recovery or continue safe mode, and should be YEs for contine and NO for recovery. Click YES.
Rebuilding in progress... Pending Specs....