can not change XP firewall

I got a laptop from work and use it at home. At firewall GUI all greyed out
(disabled) and the firewall is on. I was able to disable the firewall by
modifying a registry. But want to use GUI so I can switch back and forth
without using regedit. I know the setting is due to group policy. But how
can I enabled the GUI? I won't connect this laptop to company's network so
it won't get GPO pushed again. What registry to change?

Thanks.