No Audio Output Device Installed, No Sound/Bad Video Quality

I have tried EVERYTHING. I just got my computer working with system configuration, and soon right after that my sound was disabled and the youtube video I was watching went blocky and barely ran. This is what I have done.

1. System Resore 2 times
2. System Restore 1 more time after disabling system configuration
3. Re-installed drivers
4. Re-installed audio codecs
5. Un-plugged and plugged back in sound cords. They are in correctly

Usually it says "No audio output device installed" and other times it does not. I have had the same problem before, but system restore usually worked. I really don't think it is my sound card. HELP ME OUT. It also gives me this problem whenever I try to check my sound devices.

http://i76.photobucket.com/albums/j9/andy1796/wowstupid.jpg

Windows cannot find 'C:\Windows\System32\rundll32.exe'. Make sure you typed the name correctly, and try again.

I want my sound to work as soon as possible, so help me out.