My sister has a Toshiba laptop, with XP, 2.4 processor, and 256 megs of ram! It workeed fine until this week. Now when she tries to dial up to the internet, she gets an error message saying Communication port is invalid or in use by another application. I have checked everything, and can find nothing that is using the port, which is com port 3. I also uninstalled the modem driver, and reinstalled it, and also updated the driver, all to no avail! There are no com ports showing in device manager, either! The modem is an internal part of the MB. I'm at a point that I don't really know anything else to do! Any help would be greatly appreciated!