For Windows XP Home Edition:
---------------------------------
Open Regedit.exe and navigate to:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall
Backup and then delete the "WindowsFirewall" key.
Close Regedit.exe and restart Windows.
For Windows XP Professional:
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From Start/Run, type Gpedit.msc and navigate to:
Computer Configuration
=> Administrative Templates
=> System
=> Network
=> Network Connections
=> Windows Firewall
=> Standard Profile
Set the following options to "Not Configured" (defaults)
Windows Firewall: Protect all network connections
Windows Firewall: Do not allow exceptions
Windows Firewall: Define program exceptions
Windows Firewall: Allow local program exceptions
Windows Firewall: Allow remote administration exception
Windows Firewall: Allow file and printer sharing exception
Windows Firewall: Allow ICMP exceptions
Windows Firewall: Allow Remote Desktop exception
Windows Firewall: Allow UPnP framework exception
Windows Firewall: Prohibit notifications
Windows Firewall: Allow logging
Windows Firewall: Prohibit unicast response to multicast or broadcast
requests
Windows Firewall: Define port exceptions
Windows Firewall: Allow local port exceptions
--
Ramesh, Microsoft MVP
Windows XP Shell/User
Windows XP Troubleshooting
http://www.winhelponline.com