There is a small window that has  appeared in the corner of my screen saying "software download complete" with two choices: "install now" or "Install later". I can't close it, and I don't remember downloading anything. I tried restoring the computer to a prior restore point, but it is still there. Is it a virus?

I am using windows 7 and Microsoft security essentials. Nothing has shown up currently in any virus scan, but it did catch a trojan virus awhile ago. It said it stopped it.

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