[citation][nom]MxM[/nom]They were not removing drivers from the system at all so they could not "screw up" the system. More over, I understand that technology purist would say "always uninstall old drivers first", but if you system does not have any problems, THERE IS NO NEED of doing that, not with NVIDIA drivers (not sure about ATI). I never had any issues just to run their drivers, they install quite fine without uninstalation of the old drivers. And judging by boards NVIDIA drivers are usually superior in quality and have less problems than ATI drivers.[/citation]
Personally I've had the exact opposite with Nvidia drivers. I guess it's just me, as most people I know use Nvidia and have no issues. Not sure what's up with that, kind of weird.
As for ATI drivers, yep. No issues at all here without uninstalling drivers first. You end up with quite a large folder of unzipped drivers, as it doesn't seem to overwrite or anything, but that's easy enough to deal with.