It is likely that it is not Windows 10 can't encrypt a folder due to encrypt contents to secure data greyed out but you have no idea how to enable the Windows 10 encryption or the option Windows 7. Then how to encrypt the file/folder/document? K.B.BURAND FIX: Encrypt folder is greyed out in Windows 10 Now press Enter or click OK How to encrypt a file /document /folder in Windows 10 ? If I right click, then properties, general tab, advanced, I can not tick select content to secure data because it is gray (dim). File encryption relies on the Encrypting File System (EFS) service, and in order to fix this problem, you need to do the following: Press Windows Key + R and enter services.msc. According to users, if the encrypt folder option is grayed out on your Windows 10 PC, it's possible that the required services aren't running.