Resolve not working with any video file

Basically the title. I filmed in .MOV MPEG/4 and when importing the videos to Resolve 16 I just got Media Offline errors with only the audio working. I tried to convert the video using Hanbrake to mp4 and webm with h.264 as the codec and still nothing worked. I downloaded the latest beta version of Resolve 17 but nothing worked there either. At last I tried with some stock mp4 footage and still the same problem, Media Offline. I'm guessing there is a problem with my computer since after installing and reinstalling different versions to different drives I still get problems. I am running Windows 10 and Resolve 16/17. Any help is appreciated, thanks in advanced

Which version of Resolve are you currently running?

What camera was used for the filming?

Which version of Resolve are you currently running?

What camera was used for the filming?

It was a Nikon D800. I think it films in MOV MPEG/4.

OK.

And what version of Resolve?

And is your computer up to specs?