Basically, title. I tried several versions and I get the same error in all of them. I tried uninstalling several times, too, and I even manually deleted all the files and then installed again. This probably started happening a few days ago when I installed Anki on another Windows user profile on the same computer. I was able to use Anki in that Windows user profile, and now I can’t open it in either profile. 
The only addon I use is Migaku dictionary, I’m not sure if that information is relevant. And I use Windows 10.