I've been trying to pay for the SCCM 2007 Level 5 videos for a while now, but I keep getting stuck at the Shipping and Billing Details page when I proceed to checkout. I insert my address, click save, click "Next Step," and I get an error stating "There are problems with the addresses specified."

Any help with this would be greatly appreciated.

Sys Info:

Vista Business (in home environment)
Norton 360
IE7
Netgear Router