Windows 10: Unable to login to my latpop

Hello, hope you are well.Ive bought a laptop off someone on ebay 2years ago. i was able to use it perfectly, fine but then it started to have millisecond long black screens, once in awhile, i took it outside to sit in the sun, but then screen went fully black, but was able to see if i flashed a light onto it. i was worried it broke or something, therefore, i navigated to reset, and reset the whole lapop, but now when i try to set up my account it says "rivus" a companies name and tells me to enter a "school or work email, not a personal one" is this laptop stolen? how can i fix it.

:)