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#11
Have you disconnected the router from the power source as suggested in post #5.?
Yes, the timing is really strange. Booz Allen Hamilton is a big time company and naturally they have a huge IT department. I'd definitely give them a call and they will know by the serial number whether or not your unit was every actually in their inventory. With them involved you should have no problems getting your money back from the seller. It may be that they sold it, big firms replace their equipment frequently, and the seller pulled a fast one on you but never really wipped it throughly.
To verify if system is infected, scan if possible with following links.
AdwCleaner Download
Hitman Pro Free Download - Hitman Pro 64 Best AntiVirus Security
I once picked up a Rogue piece of JScript using Edge and had to clear it with CCleaning the Temp files but I had to launch edge to get to the "Bad page" Luckily Tampermonkey came out as an extension soon after.
Something is starting to not sound right ? A fresh install would have cleared that. OP isn't Tom from Toronto ?
I agree with Tairiku. It's a full screen browser window hijack/malware
If you really did reinstall Windows, did you delete all partitions first? Where did you get your install media from?
I would suggest a clean install, deleting all partitions and installing to a completely unallocated drive.
Clean Install Windows 10 - Windows 10 Installation Upgrade Tutorials