I don't think this is a virus.
If you can get into the BIOS setup to check that it is set to boot from the CD, and it doesn't boot from it, it's a hardware problem. And if you can't get into the BIOS at all, it's a hardware problem also. That should need repair, not a new monitor.
downloaded mircosoft office 2007 for trial useage. 2 hours later my computer blanks out. screen is black. bought new montor that wasnt is I think I caught a virus how can I boot up to clean the harddrive. I don't have anything really important on it. It's is my only computer though.. I have the original disks for the computer but they aren't rebooting the system either what can i do?