The drop down menu problem as with the picture problem is almost definetely your side. I've had a few problems with the drop down menu before, but only on computers that arn't mine (as in, when I'm out) in IE. They're working fine for me.
However you seem to be right about the shop. There's virtually no chance that it's a virus of any kind--if you've ever seen a hijacked website, they prefer to post profanities and random gibberish as opposed to saying "Fatal Error". More likely, it's a fatal error
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Evil has a new name. Demo out now!