I actually noticed this problem 2 days ago when I went to reinstall Windows 7, but I was successfully able to do it in my OS. Then cause of the weekness of my CPU which is Pentium 4, I was going to put Windows Xp on a sepret partician to use so I can use Fl Studio 11. And I can't side install Windows & because it will say on the lines of "This Version Of Windows Can't Be Installed On Your Computer Cause The One Your Using Is Newer". So I have a DVD/RW drive and a CD drive which I tried both and they don't want to boot and I made sure that the disk drives were first to boot up. And theres nothing wrong with either of the Windows 7 or Windows Xp disks they both are clean of scratches and tried all different CDs like Linux Ubuntu, Windows 2000, and Windows 95. The Windows 7, Xp, and 2000 are genuine, and Ubuntu the only way you can get it is by burning it so I'm not sure that there is anything wrong with the disks. So can anybody please help me and sorry if I didn't mention it my computer is a Dell Dimension 4600i.