We had an old compaq presario lying around so i decided that i was going to put window xp pressional on it. I took the backup disk from our dell and put it in. It started threw the setup then said i had to restart the computer. So i clicked yes to restart the computer. Then it came on with the plain blue screen and started the setup. It came to a part and said it couldn't find a file so i skiped it and it did it again with the next file.It says to make sure the cd or floppy is in. The cd is in but it isn't going. What should i do?