no, that would only make matters worse, you need to clean your system of all bad drivers and registry entries, best way to do that is reformat...

if you attempt to install a nvidia card with the system in its current state, it may cripple the system.

Do you think if i get a different graphics card it might work for example nivda.I dont think my stock g card had anything to do with the ati card working i think it had more to do with ati' drivers?so what do you think?thanks