virus?

"Hi dummy" -- that is what popped up on my computer just a few minutes ago. 
I fear I have contracted a noxious infection. Does anyone know of a worm or 
virus with this behavior? -- i.e., putting up a window saying "Hi dummy"?
I don't know what else it is doing.  The system seems to be running fine 
otherwise.
Any info is welcome. TIA
--le

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