Networks

So I've got an AD server with about 35 machines off of it. They're almost all also configured with Microsoft SCE as well. Our goal here is to have all of our machines integrated perfectly with SCE so that they pull updates that we allow every two weeks. I've been putzing around in the AD group policy settings for several hours now to no avail. The only options I have are every day or weekly and we can't have our machines restarting every week. Is there a way to configure this to our liking?

I would also like to add I'm fairly new to AD and SCE. SCE I've basically learned my way around, but AD is a neverending maze of new management consoles and folders.