I want to format this PC to get rid of CentOS since Steam doesn't work properly on it. I've put the Windows 7 DVD in the CD/DVD reader, but when I try to boot from it it gives me an error 'Windows 7 cannot boot from CD code 5'. I've already looked if I can boot from USB ports, but the motherboard refuses to give me that option. I also can't get into CentOS environment, because I don't know the password :/ So I'm kind of forced into the BIOS to make it happen. What can I do to format this PC, and give it Windows 7?