There's always IrDA, but that's a moot point - same TCP stack.
Welcome to the H/PC world.
Firstly please Soft Reset your device - stylus nib in the reset button.
Ensure that the COM port speeds are set to 19,200.
Under Windows XP
start > run > devmgmt.msc
Expand the Ports section
Delete both COM ports from the list
Start > Control Panel > network Connections
If you have "Accept incoming connections" enabled, please delete the entries
(unless they're VPN
)
Reboot the computer - the com ports will be put back and the stack refreshed.
Please ensure that all firewall and Anti-virus applications are disabled from running on the system.
Close down any thing that can use the COM Ports - terminal applications, other PDA clients, GPS, Tablets etc.
Give the terminals on both ends of the Sync cable a clean, as well as the Port on the H/PC if you can.
If that doesn't work
If possible initiate a Hard Reset on the H/PC -
http://www.hpcfactor.com/support/cesd/s/0034.asp
Fully uninstall all Windows CE applications that you may have installed on the PC and then uninstall ActiveSync. Reboot.
Delete the C:\program files\Microsoft activesync folder
Reinstall ActiveSync.