Failed to Load Package Manager

Hey everyone,
I just downloaded Unity on my Windows 10 and made a small room with it. When I wanted to play the scene, this pops up:

When I looked at the errors, this is what appeared:

I looked it up on the internet but I couldn’t find anything useful. Any idea how to fix it? Thanks!

I believe that is because of a bad Unity install, I think if you just reinstall Unity it should work; I would also delete the download you have of whatever version of Unity you are installing and redownload that as well.