COM PORT PROBLEMS NT SERVER 4.0

CONTROL REGISTER FOR COM PORT 1 OVERLAPS WITH CONTROL REGISTER FOR COM PORT 3. TRYING TO INSTALL A MODEM, HOWEVER THE COM PORTS ARE OVERLAPPING. HOW DO YOU FIX THIS PROBLEM. IS THERE A WAY TO RESET THE COM PORTS OR DO YOU HAVE TO REINSTALL THE OPERATING SYSTEM. NOTE: NOT RUNNING CHECKPOINT FIREWALL.

PLEASE HELP

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