I've solved my issue. After trying anything I could think of; reinstall BB DM, update modem drivers etc... multiple times. I narrowed the issue to dial-up networking. I tried using the modem only to tether the BB. Once the connection authenticated the PC froze. I did more searching of the Internet and came across this page:
I ran the command
netsh int ip reset c:\tcpipreset.txt
I checked the txt file that was created and quite a number of registry keys were reset. I suppose I'll have some configuration to put back on my TCP/IP settings. We'll see.