In the audio settings I have adjusted the ASIO settings. If, however, still not ...
Motherboard: P4P800-E; Sound: Realtel AC97.
To what extent do you have the ASIO settings adjusted? Maybe the onboard sound is no ASIO and you should therefore there Direct X Multimedia Driver O.ö. supports Select ... ?
Did you really just replaced your MB, or Windows, or Premiere reinstalled again? If not, perhaps refers to premiere on old entries, etc. ... Mussu again on debugging;)