My jotted down notes about the client install. I'm sure you ran PVXCOM, but for others....!
If you get a message about Login Failed for XXX company and the info button mentions PVXCOM, go to MAS's Home folder and run PVXCOM.exe. If it doesn't reference PVXCOM, check the driver that it's using under Company Information.
If PVXCOM doesn't run, run the C++ redist 2008 install.