It's not going to happen. I can think of a few ideas, but those can generally be worked around or will create other issues.
So what I'd propose is the following. Put out a memo about a new company policy. If a person takes their laptop home, connects it to some other wireless network, and it is then infested with malware, the costs associated with cleaning it will come out of their paycheck. You'll want to figure out some hourly rate to deal with this, and include it in the memo.
It's a reactionary measure as opposed to proactive, but Windows just isn't designed to be locked down like you want, so you're best bet is to seek other methods.
Long story short. I want to restrict my employees from logging into ANY wireless access point other than the one at our work. Employees have access to laptops for work use and I want to restrict them from being able to take the laptops home and using them on their home networks and then bringing them back to work to connect to the works network. This will reassure that they are not bringing viruses from home and putting them on our network. Unfortunately since they are considered a "work tool" I can not stop them from taking them away from work, but I would like to restrict them from connecting to any other access point other than ours at work. Any suggestions?