The best thing is to use the manufacturer's software to remove itself. That doesn't always work, unfortunately. I have had upon occasion had the vendor's software (or the Add/Remove software control panel) fail to remove the display adapter software while I was using it. You may need to change your display to one of the standard display adapters before you can remove the software. If you boot into safe mode, you should be able to remove the software using the Add/Remove software procedure (as Windows only uses it's own standard VGA driver in safe mode). You can also force Windows to use the Standard VGA driver without using safe mode. This Microsoft Knowledge Base article
talks about one way to do that, and I've used this one. However, this Symantec article
does, too, and sounds much less complicated. Once you are using the Standard VGA driver, you should be able to uninstall the drivers.