I know this is an old thread but I have an answer to this dilemma which I hope might help someone in the future...
What I ended up doing was going into Device Manager, Selecting View>Show hidden devices, expanding the Sound, video and game controllers branch and deleting/uninstalling all references to the sound card. Once you reboot, your card should be detected and re-installed properly without the offending "2-" designation. Yes, it is correct that you need to uninstall devices when pulling them out of their slot. I always forget... :P
Hope this helps someone in the future fix this annoying little problem!
