Nero7 and WMP10 : Problem with Mpeg Video

I installed Nero after uninstalling Nero 6.6. Now Windows Media Player 10 is unable to open / play mpeg video files because the default video codec in WMP is changed to If I delete from C:\Program Files\Common Files\Ahead\DSFilter, WMP reverts to its original codec and plays the file. My questions are :

  1. What does do and by deleting it, will Nero continue to function properly ?

  2. Why should Nero 7 make the default video codec for WMP ?

Any response appreciated.

having the same issue myself. is there a way to change what codec WMP defailts to?