NIS 2009 turns off windows firewall

I want to use the Windows firewall, not the NIS which is all off, it turns off the Windows Firewall on start up. 

 

If I disabled NIS via windows services and disable antivirus software so it doesn't load, the Windows firewall stays on. 

 

Is this by design or a problem with the software?

 

 

System:

Windows Vista Sp1