Depends if it's at least the SP1 version (or later).It shouldn't be an issue hooking it up to your router long enough to activate it.
That's what I thought to but my wife almost killed me when I went to hook it up. I guess it only takes a matter of minutes to corrupt the whole house. That's why I was was looking for another way to do it besides on line..It shouldn't be an issue hooking it up to your router long enough to activate it.