If the Firewall you already is satisfactory, then the XP Firewall can be
turned off. Sometimes, running two programs of the same type at the same
time may cause conflicts.
In the case of several major firewall vendors, SP2 install will recognize
your firewall and not activate its own.
Otherwise, you may manually inform SP2 that you have your own firewall and
don't want Windows firewall.
You'll find those with different points on view on this. Here's
mine: don't run two firewalls. You achieve no extra protection,
you incur the extra overhead of running two firewalls, and you
run the risk (probably small, but not zero) of conflicts between
them.
The Windows firewall monitors incoming traffic only. Almost any
third-party firewall will also monitor outbound traffic, stopping
rogue programs trying to call home, and is a better choice.
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