Well the first thing I would probably do is check for any viruses or spyware that may be lurking on your system. Next I would check the windows update site to make sure everything is up to par. Most of the time windows actually can download and install the updated drivers needed for your hardware. Also, make sure your other sound card and video card are disabled in your BIOS. You can also try uninstalling the old drivers manually from Windows Explorer and the registry. If all else fails, reformat and start from scratch.
