Simply right-click a folder, select "Add to archive," and set a password. Windows BitLocker
: Run the icon again, enter your password, and choose to "Minimize" (temporary access) or "Fully Unprotect." Features of the Pro Version
Lockdir is a utility that allows users to password-protect and hide their folders. If you're looking for the full version of Lockdir or a patched version, I would recommend exploring legitimate sources.