HELP PLEASE!!!! Error 008: Open Port Error

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I have just tried to update my XDA to the Special Edition ROM. When I ran the program it got to Step 4 Upgrading ROM image and tehn came back with:

Error 008: Open Port Error
Can not open a COM/USB Port. Please use Device Manager on PC to make sure that the COM/USB port is available and working properly.

Have to click on OK at which point the program just closes.

Rerun the program and it comes up with an error:

Apapt ROM
Please connect your XDA to ActiveSync

Doesn't do anything on Retry. Have to Cancel.

Cancelling brings up Step 4. Upgrading Screen and the Error 008: Open Port Error again.

I'm stuck in a loop.

The XDA won't do anything now - it is stuck on the Upgrading Screen.

HELP PLEASE!! I'm dead in the water here ....