Wat had happened to by Firewall!

hi to all from past three days my PC with Win XP sp2 is behaving strangely on start up a popup pops out saying firewall is turned on and status of antivirus ok but after some seconds another popup says no firewall is turned on and when i try to enable it there is an error message that "Due to undifined problem windows cant display firewall settings........
I am using XP default firewall

*img134.imageshack.us/img134/3913/firewall22hu.th.jpg

*img101.imageshack.us/img101/5823/firewall1ee.th.jpg

wat to do.......