App Store gives "An unknown error has occurred" when I try to log in

I know I'm using the correct username and password -- using a different one gives a password-specific error, and the username/password works correctly elsehwere.
I have applied all updates, and rebooted.
I just had my SSD replaced (got the machine back today), and the apple store put snow leopard instead of lion on it -- my lion upgrade was purchased in the app store previously. So, I currently have mountain lion on this machine.
Thanks!

urgh... just noticed my previous post said i have mountain lion... i meant that i have snow leopard.  no idea why i messed that up!
anyway, i just tried reinstalling snow leopard from the usb key that came with the computer. Then, I installed software updates until it told me there were no more updates. After that, I tried the app store again, and it still is giving me the unknown error. really irked by that. may have to take it back to the apple store yet again, to see if i can figure out why the app store won't work.

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