I have just upgraded from V5.5 to V5.6 of Sygate Personal Firewall (SPF), which is free to non-business users, "because it was there". I am running Win2K, which is fully up to date and patched (according to Micro$oft). V5.5 worked fine for me, although I was slightly concerned about its CPU usage - but it did the job.
Now I find, with V5.6, it does very little after being started ("smc -start") for about 15 seconds. Then, it starts making thread after thread, until eventually it gives up and crashes. (I watched its behaviour using Task Manager process page.) V5.5 used no more than three threads, IIRC. Until I find the installation image for V5.5 again, I am firewall-less.
Can anyone suggest remedies?