I had the similiar problem you now have, but with Vista. What I did to fixed it was to go to the microsoft help page, I entered my problem (what was wrong), I then followed the instructions that guide me as to what I needed to do. Basically, I needed to delete two (lower and upper) programs that were not allowing my computer to read CD's. If your computer is new this is a normal problem that you have to go through. Usually, your computer manufacturer should also help if it is new or within warranty.
Hope this helps!