COM PORT PROBLEMS NT SERVER 4.0

THE CONTROL REGISTER FOR COM PORT 1 OVERLAPS WITH THE CONTROL REGISTER FOR COM PORT 3. CHECKPOINT FIREWALL IS NOT INSTALLED. HOW DO YOU RECONFIGURE THE COM PORTS? DO YOU HAVE TO REINSTALL THE OPERATING SYSTEM OR IS THERE ANOTHER WAY TO FIX THIS?
PLEASE HELP

THANKS!!!!!!!!!!!!!!!!!!