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CMD prompt window pops up and instantly disappears periodically

Writer Emily Wong

Windows 10 - Every 10 minutes or so, a command line window flashes on my computer. I'm afraid I may have been infected by something. I've been staring at the Task Manager (and process explorer) for days, and can't narrow it down to what is causing this. I've tried MSconfig to check the startup programs- nothing seems out of the ordinary. I've used Malwarebytes, and ran Tron Script once, and installed all the new windows updates, in hopes it would fix the problem, but it still persists.

I may have downloaded something.

Is there a way to check the Event Viewer to see what is launching this window?

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3 Answers

Check the task scheduler, see if anything added in there could be triggering it.

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I think it's fixed! I checked the Task Scheduler, like NetServOps said, and found one line item that was scheduled to run every 10 minutes. "Firefox Default Browser Agent A99BB431EF49E2C3". I disabled it and have not had the flash of the cmd prompt since! Thank you so much.

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I had the same issue a few years ago, and I found the culprit using the Sysinternals tool Process Monitor.

  1. Download Process Monitor.

  2. Filter/Filter/Operation is "Process Create"/Add

  3. Leave Process Monitor running until it happens again.

  4. Check the window:

screenshot of Process Monitor output

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