Microsoft has stated:
"...Using two firewalls on the same connection could cause issues with connectivity to the Internet or other unexpected behavior. One firewall, whether it is the Windows XP Internet Connection Firewall or a different software firewall, can provide substantial protection for your computer."
In the Microsoft Help and Support Center for SP2:
"In Microsoft Windows XP Service Pack 2 (SP2), Windows Firewall is turned on by default. (However, some computer manufacturers and network administrators
might turn it off.) You do not have to use Windows Firewall-you can install and run any firewall that you choose. Evaluate the features of other firewalls and then decide which firewall best meets your needs. If you choose to install and run another firewall, turn off Windows Firewall."
Microsoft Knowledge Base Article - 875356
How to configure the Windows Firewall feature in Windows XP Service Pack 2
"...If you decide to install and run another firewall, turn off Windows
In pcworld.com, an article by Scott Spanbauer
From the October 2004 issue of PC World magazine
Posted Friday, August 27, 2004
Under, "Tweak the Firewall" for SP2 one of his paragraphs echoes the MSKB
and the MS Help & Support Center:
"Once you've installed a bidirectional firewall, I recommend disabling the Windows Firewall altogether. Occasionally, firewalls obstruct an application
you're trying to use over a network connection--and there's nothing more frustrating than spending a half hour tweaking, disabling, and even uninstalling a firewall, only to discover that the other firewall was the culprit. To disable the Windows Firewall in the Security Center, click the Windows Firewall link at the bottom of the dialog box, check Off (not
recommended) in the next window, and click OK."