BleepingComputer.com: Need help to enable SoundMAX driver

I'm working with someone else in "Am I infected? What do I do?" to resolve a Vundo infection, but now I have trouble with my sound driver(s). I was using AutoRuns yesterday to stop Windows from trying to load a virus that had already been deleted. Soon thereafter I tried to adjust the sound volume through Volume Control and it said, "There are no mixer devices available. To install mixer devices, go to Control Panel, click Printers and Other Hardware, and then click Add Hardware. This program will now close." (I also cannot play any sounds: from files, Internet, or CDs.) I tried to uninstall SoundMAX Integrated Digital Audio through Device Manager and then reinstall it, but that didn't work. The driver is there, but it just isn't loading. I tried updating the driver, but Device Manager says there's no version more current than what I have. I'm reluctant to roll back or download a whole new driver file (smwdm.sys according to AutoRuns) because I'm not confident dealing with drivers. I've tried to find what I may have inadvertently disabled through AutoRuns, but smwdm.sys seems to be the only candidate, and that has a check mark beside it. Of course, I have no more luck using msconfig.

As far as I can tell, I simply disabled the driver, so I need to enable it to load when Windows boots up. I also assume that my codecs and other sound controllers that are currently disabled will come back if I restore this one driver(?). It's possible that the malware could have caused this problem, but that seems unlikely because it only happened after I messed around in AutoRuns. That's why I came here. If anyone out there can help, I will be forever grateful!

Specs:
Dell Dimension 4600
Windows XP, SP 3

Download a new driver:
http://support.dell.com/support/downloads/...p;fileid=122481
From here:
http://support.dell.com/support/downloads/...tid=&impid=

Thanks for the reply. I had found that site but wasn't sure I should download it because I didn't recognize the name of the driver. Anyway, I downloaded and installed the new driver but I still get the same error message. Add Hardware still tells me that the driver is there but it has been disabled. How do I enable the driver? Is this related to the virus or viruses I'm still trying to remove?