Try the OneCare removal tool first:
http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/399071e2-49dc-4767-932d-d261e3965943
If that doesn't resolve the firewall issue, try this:
Start/Run - type "regedit" without the quotes, click OK
Delete these Registry keys if they exist:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall
\DomainProfile \EnableFirewall=0 (DWORD data type)
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall
\StandardProfile \EnableFirewall=0 (DWORD data type)
WARNING - editing the registry could cause your PC to be unusable.
You can also contact OneCare support for help:
How to reach support (FAQ) -
http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~