Sygate were taken over by Symantec (the Norton People)

and the only firewall they now supply is their own. You can get latest version of Sygate's from
'oldversion.com'.
Having said that when I upgraded from W98 to XP I stopped using it in favour of the built in XP firewall (I know it only stops incomings) and have had no problems. I also have Adaware, Spybot, SpywareBlaster and Avast on board.
If you wished you can quite safely use that latest version of Sygate (it was quiet stable as I recall) or one of the other free firewalls. AFAIK the only updates to firewalls involve fixes for bugs rather than for different types of hacker attacks. (I'm sure someone will correct me !

)