I have a old Palm M500 that I'm trying to upgrade to 4.1. I have a MacBook and running Windows 2000 via VirtualBox in order to run Palm Desktop and hotsync. I'm able to run the upgrade installer but after the initial hotsync step and reset of the m500, the Palm's screen turns dark and then I get this message that pops up on the Palm Upgrade Utility "Encountered an error opening a communications port to the handheld. Invalid communications port." Any help would be greatly appreciated.