You've done everything I would've. Just make sure your INF mod is to the "HDXCR.inf". You'll want to do two things first though: Uninstall EVERYTHING Audio Driver related --including deleting/moving the driver folders from %WINDIR%\System32\DriverStore\FileRepository also, I find sorting by Date-Descending [newest on top] works easier -- to make sure nothing older is being installed on accident since the INF has been modified and no longer WHQL. Also uninstall everything Creative related, including everything from the less obvious directories like App Data, Program Data and Common Files (in Program Files, check both normal and "(x86)" folders). Reboot after that, reinstall drivers, reboot again, install Creative X-Fi MB. I don't think there is any difference between X-Fi MB and X-Fi MB2, either. Actually, from what I can tell is that MB2 is less feature packed it seems, but does have like one additional thing (not that I remember exactly what that is). If that still doesn't help, I would say do like Bo$$ said and hit up the DriverHeaven forums. All I know about with this mod is from what I've read, and through many hours of trial and error (mostly error ).