It may be a driver issue. Check this article and see if palm.com can help.
Problems When the Palm HotSync Version 3.0 Program Is Installed
An Error has occurred. vcomm(5) address
http://support.microsoft.com/?kbid=271480 (ME 8/6/2002)

Signature
CAUSE
This issue can occur if the Palm HotSync version 3.0 program is installed on
your computer before you upgrade to Windows Me and the HotSync cable or
cradle is currently connected to your computer.
RESOLUTION
To resolve this issue, obtain and install the latest version of the HotSync
program from the following Palm Web site:
http://www.palm.com/support/downloads/
Henri Leboeuf
Web page: http://www.colba.net/~hlebo49/index.htm
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> when i was installing a modem into my pc,a fatal
> exception ERROR occured.the error is:
>
> A fatal exception OE has occured at 0028:c02506d8 in vxd
> vcomm(07)+00000188.The current aplication will be
> terminated.