Andy,
Over the past 6 months the Apro Exception problem has faded from my memory. I don't remember doing anything to correct it for good, I think I would have posted here if I did, I guess it left just as it arrived. I am using Windows XP Pro. Perhaps, Microsoft, in their infinite wisdom has decided users of Windows 7 do not need to control their ports. Try to find port control in Win7, then disable the port your weather system is using, then enable it and hopefully that will work.
Good Luck,
George