Hello, I have windows 7 (32) based pc, and all of a sudden, my audio card stopped working. I looked into the device manager, and found a bunch of devices with yellow explanation point, with error "code 3". I tried searching for a solution, and I found that it might be because a corrupt file: wdf01000.sys. I went to the "windows\system32\drivers" folder; however I couldn’t find this specific file. Also tried entering the registry tool, and look for registry entries on "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Wdf01000" but I couldn’t find them either. I tried performing this article: http://www.explosiveknowledge.net/main/2012/02/05/drvcd3/ with no success: didn't find the file, and the registry file that I made won't update the pc registry. I think that is all because some sort of a virus. Are you familiar with this type of behavior? What should I do next? Thanks, sam.