ok, this has happened before and it happened again. my computer has a registry error where i cant use any cd drives, i fixed this once by changing a number in regedit, but then i couldnt play any audio. well i was playing need for speed and i decided to see what it looks like on maximum graphics settings and once i changed it, all audio stopped, so how do i fix this for good so i can use cd drives again and not have to sacrifice audio?