Apparently there's a new virus spreading through MSN Messenger called W32/Sumom-A, or W32/Crog.worm, or W32.Serflog.A.
Info:
http://www.sophos.com/virusinfo/analyses/w32sumoma.html
If you check out the "Advanced" tab of that page, you'll see that the virus actually tries to pose as MsgPlus (Messenger Plus! 3.50.exe)...
More info...
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http://home.businesswire.com/portal/site/google/i...005979&newsLang=en
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http://www.computerworld.com/securitytopics/secur...801,100264,00.html
Someone in my family actually downloaded this virus, and I couldn't identify it until just now. Fortunately it didn't do any damage because it wasn't executed under an admin account, this PC is pretty secure, and I noticed it right away.