Recently bought a ex business computer whereby everything had been deleted by their It guys, now when it turns on it states reboot and select proper boot device or Insert Boot Media in selected Boot Device – I have tried to load Windows XP Home Edition as it has a COA on the side, it loads window no problems but the screen resolution is on low and the display screen colours are not great, and the screen resolution can not be changed???? Can you give me some idea what I need to do to fix this???? Desperate.