Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1986-2001 Microsoft Corp. C:\WINDOWS>netsh firewall reset ?
reset
Resets firewall configuration to default.
Remarks: Resetting the default settings will delete all settings for
Windows Firewall that you have made since Windows was
installed. This might cause some programs to stop working. Any
custom settings that you have made for Internet Connection
Sharing will be deleted and Internet Connection Sharing will be
disabled.