if i go to internet properties intranet then sites, i cant sites is greyed out.
so
I Navigate to Computer Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page >> Site to Zone Assignment List
enable it add the \127…@port\random-letters\vault and 1 in the right column
Seems to me like a false positiv message from third party antivirus / ransomware protection software. I’m on windows as well (using defender as AV) and do not have problems.
Please check your AV Software if there’s some kind of ransomeware protection enabled, and if yes try to exclude the local vault storage location.
When you created the vault you selected a storage path. You can also see this in the Cryptomator app below your vault. This is where your encrypted files are stored.