There can be a variety of difficulties. Some of the motherboards - the P4M266-8233A have onboard video. It is possible that when you erased the drivers for the Nvidia installation of new drivers that the board reverted to the Savage onboard video. If your machine does have onboard video, you will need to turn them off in BIOS.
Or, you could have not uninstalled the old Nvidia drivers and just installed new ones of the old, which eventually leads to problems.
Or, this is a VIA chipset and you may need to reinstall the VIA 4in1 drivers which act as its own layer to configure hardware.
Sometimes, it is helpful for you to describe step by step what you did, for example, why you wanted to put in new Nvidia drivers, was this a new card or one that has been running for a while, exactly the procedure of how you went about installing the drivers, whether you know if you do have onboard video. This is not to say that you didn't give a lot of helpful information, but in describing what you have done sometimes helps in figuring out how to undo it.