Are you using a genuine copy of Windows XP Pro or a cough cracked copy, if so do you get any error messages ie RPC call?
I'm pretty sure that I read in an earlier post something regarding not placing DVDR's on RAID controllers?
Please correct me if I'm wrong regarding the last comment.
I so Stoopid, I was reading 'xtacydima' spec for his pc and thought it was yours!!
Have a look here at Wes's FAQ: