If I were you I would start from the beginning but this time I would write zeros to the drive first using the hard drive manufacturers utility floppy. This will ensure that the drive is clean and rid of any remnants that are there. When that's finished just do a clean install with your new video card installed and it should be fine.
What brand is your hard drive?
I hope your a patient person because it will take about an hour to write zeros to the drive...........
What brand is your hard drive?
I hope your a patient person because it will take about an hour to write zeros to the drive...........