Just installed OSX 10.6.8 and Can't Buy from App Store

I have installed Snow Leopard 10.6.8 and ran Software Update, and now I want to upgrade to Lion.  I can open App Store, log in, access my account, but when I try to purchase Lion I get a message "We could not complete your request. There was an error in the App Store. Please try again later. (4)". When I click OK, I get the message "Unknown Error." I really don't want to have to reinstall everything - please give me an idea of what's going on.  Thanks.  By the way, I also created a new Apple ID with a different email just to see and I get the same error.

Not sure. Maybe something here:
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