You probably need to re-install the Earthmate drivers also. When you install, it asks if you are going to use the Earthmate with Delorme software only, or 3rd party software. If you select the first option, I'm pretty sure the Earthmate won't show up on a COM port. If you do the 2nd option, it install the USB-to-COM drivers.
2004 Toyota 4Runner Sport 4WD
Opus 90W, Epia M210K, Lilli 7" TS, 30GB, CDR/DVD Slot, PowerMate, Earthmate, 200GB Seagate 3.5", Verizon BroadbandAccess, CentraFuse, Valetine1 .....