Try other USB to UART adapters or a serial port card. There are many other solutions out there but the hard part I find is that folk usually want what they have fixed.
<span id="INSERTION_MARKER">I am running a Dell 380 Precision<span id="INSERTION_MARKER"> <span id="INSERTION_MARKER"> <span id="INSERTION_MARKER"> Desk top with XP Professional.I have an ICOM Short Wave radio connected via Com 3 and an OWL Electricity Monitor connected via Com 5.<div><span>At the moment both are working fine but as soon as I shut down the computer, the next boot up fails to connect the radio with any Com port. The only way I can get connected is to delete the Silicon Labs CP210x USB to UART Bridge and re-install. All divers are up to date. The problem has risen occasionally over the past few months but usually goes away after a time. It is now with me permanently.
<span>Hope someone can give me a steer on this.