CMD keeps popping up, but it's not caused by Office.

[newbjumper]

I basically have the same problem as this person, (http://www.tomshardware.com/forum/id-3425919/command-prompt-randomly-pops-disappears.html) but I don't have office installed. In fact, I deleted it + the Get Office thinghy through CCleaner. It only shows a blank CMD screen, as shown here (https://gyazo.com/6e5424ba33b324e98e3baa9847d98732), so what could it be?

 

[gardenman]

Hi, these are tough to track down. Give this a try: Wait for the command prompt to open again and write down the exact time that it happens (including seconds) according to the computers clock.

Next, open a elevated command prompt (Run as Admin) and type in the following command:
schtasks /query /FO TABLE /v |clip

This will copy the scheduled tasks lists to your clipboard. Note, I had to run the command twice. The first time it only showed 5 or so scheduled tasks for me, the 2nd time it showed 400+. Maybe that's a Windows bug.

Next, open Notepad and choose Edit / Paste. Look at the Last Run Time column. See if you can find out if a scheduled task run at the same time that you seen the command prompt Window. It might be easier to do a Search and look for the hour and minute that you seen the command prompt. If you do find that the command prompt is being run by a scheduled task, you can either disable it, or at least look up more information about why it is happening (for example if a specific program is running the command prompt).

I've never seen an all white one like your screen shot, but that could be because the screen shot was taken as the Window was being created and a few milliseconds later the black screen showed up. You can also use a video capture program to try to capture the Window to see what it says. I've heard of people using their cellphones to record a video of their screen to capture what a command prompt says.

I've seen these be malware before too. Consider downloading the free version of [Malwarebytes] and do a scan with it.

 

[newbjumper]

Hi, these are tough to track down. Give this a try: Wait for the command prompt to open again and write down the exact time that it happens (including seconds) according to the computers clock.

Next, open a elevated command prompt (Run as Admin) and type in the following command:
schtasks /query /FO TABLE /v |clip

This will copy the scheduled tasks lists to your clipboard. Note, I had to run the command twice. The first time it only showed 5 or so scheduled tasks for me, the 2nd time it showed 400+. Maybe that's a Windows bug.

Next, open Notepad and choose Edit / Paste. Look at the Last Run Time column. See if you can find out if a scheduled task run at the same time that you seen the command prompt Window. It might be easier to do a Search and look for the hour and minute that you seen the command prompt. If you do find that the command prompt is being run by a scheduled task, you can either disable it, or at least look up more information about why it is happening (for example if a specific program is running the command prompt).

I've never seen an all white one like your screen shot, but that could be because the screen shot was taken as the Window was being created and a few milliseconds later the black screen showed up. You can also use a video capture program to try to capture the Window to see what it says. I've heard of people using their cellphones to record a video of their screen to capture what a command prompt says.

I've seen these be malware before too. Consider downloading the free version of [Malwarebytes] and do a scan with it.

I have captured the screenshot on video using shadowplay, and then screenshotted it here. So I concluded that every hour at x:36:56 myPlex VPN route is doing it. I disabled it now, hopefully it works. Thank you very much!