App Store displaying stranger's Apple ID

I tried to buy Lion today. In the Store menu the email address for my Apple ID is correctly displayed. But when I try to purchase Lion, a panel pops up showing an Apple ID I've never heard of. I rebooted, logged out and back in again, and the same email shows up. When I try to log in with my own account, I get the "There was an error in the App Store. Please try again later.(4)" message. Any ideas about what could be causing this? I'm at my wits end and I'd really like to get Lion as soon as possible.

+1 to the problem
Already contacted Apple MAS Support and didn't help about this,
The only thing they could do is to appoint me with an Apple expert
Steps that I've done,
Logout ->login
Logout -> reboot -> login
Logout -> delete all MAS's plists -> reboot -> login
Logout -> delete all MAS apps -> reboot -> login
Create a new partition -> install SL -> login
They all failed the only step that I DIDN'T try is:
Goto strangers Mac ->login -> purchase Lion -> go back to my Mac -> purchased -> download Lion
So if you can find someone's computer try this step!!

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