Thanks, Erick.
I just found the problem though. Apparently my host was hacked at some point. It appears to be a Windows-only issue (big surprise), as it definitely doesn't affect my Mac (we're an all Apple household). I've removed the malicious code and I'm so super-sorry to everyone that experienced any trouble with this!
I'm going through the other sites I have on the server now (quite a few... this stinks!).
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