Well, I only disabled the services that i'm pretty sure i am not going to use. And I read a description of those services on the net first, so its not like i just disabled random things.
The DVD drive is new, and I burned a couple of dvd's with it two weeks ago (I don't remember doing anything to my software since then). It also recognized blank CD's just fine, but when i put a blank dvd in, and i tried several from the same box that i used to burn the other dvds earlier, it displays: Free space 0 bytes, Used space 0 bytes. I do have another computer in the house, but it doesnt have a dvd burner.