Windows keeps giving me a popup and I don't know how to stop it

[dsAnderson56]

Hi! I keep getting a constant popup that reads: "windows cannot find "\tmp\taskhosts.exe", make sure you typed the name correctly, and then try again. "I never typed in anything, and this popup keeps appearing every 10-15 minutes, in the center of the screen. It's completely infuriating and has been like this for a few days now.It all started after I downloaded and tried to run an application that was a virus, although McAfee protected me from that virus. I have no idea what I should do. See the attached image for the popup itself.

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