How do I lock down Windows Firewall on remote (non-domain) machines that have admin access?

I need to provide documentation and evidence that indicates mobile devices with direct connectivity to the Internet for accessing corporate networks have personal firewall software installed and active per organizational standards and can not be altered by mobile computer users.  
I need a way to send down a script or something to run on remote machines to set the WIndows Firewall (or similar product) up and lock it down.  Can this be done using Windows Firewall?  Is there any free or really cheap firewall software out there maybe that would be easier to deploy?
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Will SzymkowskiSenior Solution ArchitectCommented:
Hello there,

Unfortunately if they are a local administrator and not on a domain, they will be able to disable the firewall. what you might want to take a look at is the local GPO that allows remote administration exception.

You will need to set this up on the users local machine and it can be found by doing the following...
Computer Configuration>Administrative Templates>Network>Network Connections>Standard Profile
On the right side there is a remote administration exeption enable that and configure it.

Might do the trick.

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