I have received this message from PC-Cillin "detected unstable behavior in the network, hardware, operating system, or another app. and automatically reverted to it's last know configuration ". I have also received a low memory message. This is a brand new system I built with a good MSI board , i gig of Kingston mem. After the PC-Cillin message and reboot It is running stable. When it wasn't you could not do any thing especially online with numerous pages open up. Very strange behavior. I am running Sunbelts Counterspy which is a very good anti spyware program and running the XP Firewall. This seems to be a program draining the PC and not spyware because very little surfing was done. I will uninstall Counterspy to see if there is a memory leak. Has any one had this problem? Bruce