Try removing the Plextor MVP 2000. This seems to give errors at times, from what I have been told.
Also, make sure that you have updated your DirectX to version 8.0 from:
http://www.mtu.com/vbulletin/showthr...p?threadid=772
The other thing to make sure that you have done is update the ASPI drivers as stated at:
http://www.mtu.com/vbulletin/showthr...p?threadid=493