The Sygate one is an older version before that occurred I think.
Note that from November 30th, 2005 all Sygate consumer firewall products have been discontinued but this versions is available here for free use.
I had a look at the Outpost site and with the free trial version it is suggested that any firewall applications should be uninstalled before downloading as it could cause instability (crashes). I really don't want to go there again, but I also don't wish to tamper with XP's firewall. Is turning it off enough as I don't think I can uninstall it, not sure.
Earlier this year I tried downloading Kerio onto Michael's computer, it was to be burn to CD for the PB, but it wouldn't download until I uninstalled the XP's firewall. I ended up downloading it as a zip file.