heh, gotat love tech support people.
Well if that didnt work, to test if its the cddrive and not the cd, borrow a windows cd from a friend. Around here, everyone has one, they are like candies.
If you get the SAME problem then you know its your drive.
(then again, if you're using a burned copy, it could simply be some skewed copy protection that bungled the file when it was being burned.)
Anywho, since my first bit of advice didnt work. If nothing else someone else here works, simply take it to the nearest pc shop. for 25$ service fee they should fix you right up (unless you need to replace any hardware)