If your web hosting service declines the ' 777 ' value from your FTP access, simply try it out from your cPanel's web hosting service account. This should definitely work.

Note: By the way, there are no CHMOD settings from Windows Server. Meaning, you'd need to, either, contact your web hosting service in order, for them, to set a higher permission level towards your account or, if you're the actual web hosting provider, you can edit this out from your IIS Settings under your control panel window.