Red screen saying I have a Trojan. I allowed remote access.
I don’t know why you replied to this completely not linked general idea, but you got scammed. Make sure you change all passwords and consider they might have any financial information on your computer. Even though you reinstalled Windows, I
would still follow up.
From Quietman, see: I have been hacked…What should I do?
Next, follow the instructions here even if the pop up is gone.
http://malwaretips.com/blogs/remove-tech-be there for-scam-popups/
Also run this tool.
SuperAntiSpyware (Free description)
PSA: Tech Be There For Scams Pop-Ups on the Rise
https://blog.malwarebytes.org/fraud-scam/2014/11/psa-tech-be there for-scams-pop-ups-on-the-rise/