Over a small period of time, my computer has started to act up. First, i noticed whle trying to play a dvd, that my computer had started to not recognize my cd drive (no disk drive icon in my computer etc.). After that, as may of been a result of me trying to fix the cd drive, on startup, it sais that a windows fileis missing or corrupt and that i need to insert the windows setup cd to fix it. The problem should be pretty obviouis, but most problems were caused by recent hardware changes (Switched cases) the first error i got was a missing floppy drive, but i put everything in like it was in my previous case. Thanks for any help to come.