I've got the Sygate Personal Firewall Pro 5.0 and when the 'update signature' failed, I wrote them an email asking when updates go out for signatures and new versions (which might have your 2000 fix) and they replied back saying they haven't set up the patches/signature updates yet and will be done soon. Don't know when that really is though.
About Sygate, is there a free version of version 5 pro? Cause the versions 4.x where always free for personal use but they gave probs with Win2K workstations when wake-up from stand-by. So i donwloaded the version 5 and tested it on a box, now it seems that you can only use this version for 30 days? cause it's the pro, but I never wanted the pro! I only needed a fix for my win2K error... so perhaps I will stick with version 4.x or Tiny.