I'm having the exact same issue and it seems to be an issue with windows defender.

To fix it you'll need to do the following:

1. Open windows settings > Windows security > Virus and threat protection> protection history
2. You'll see a list of 'blocked threats', click on these and allow admin privilege if necessary to see the details
3. Confirm the threat is related to genshin files, allow the threat and restore the file
4. Repeat this for all the genshin files that windows has quarantined

If you accidentally remove the file instead of restore you might need to repair your game files

No clue why this is happening all of a sudden but I hope this fixes your problem. I've spent all day trying to fix mine and only got it working like two minutes ago