CAUTION: You must be very careful when using the Registry Editor. It is very important that you modify ONLY the entry listed below or else you could cause serious problems with your system!
1. Go to Start | Run... and issue the command regedit.
2. In the resulting Registry Editor, go into HKEY LOCALMACHINE / ENUM / PCMCIA / LT_MODEM-PC_CARD.
3. Double-click 0.
4. At the bottom of the right-hand column, double-click PORTNAME.
5. In the resulting window, change "Value Data" from the highlighted COMx (e.g., COM4) to your desired COM port setting.