Unlikely that anything Office Install does on the hard disk will cause troubles with booting before the hard disks are even listed, let alone accessed.
And unlikely also that any legitimate Microsoft Office cd installation would do something in the BIOS, let alone something that is so destructive that the install is stopped and the computer dies.
So I assume that just incidentally something on the motherboard broke during the install. And that needs repair, or more likely replacement (of CPU, memory and/or motherboard). Find a trusted repair shop if you can't do it yourself.
I'm using Win XP. I have Office 2002 on my computer and just loaded Office 2003. The screen went blank during installation and now the computer hangs during startup, at the initial dos screen, before the hard disks and CD-roms are detected and listed. I can enter setup, but on exit, it returns to the initial screen and hangs again. The computer was working fine before I tried to load Office 2003. I can't get to the screen to select Safe Mode or return to the last good configuration.