I installed ESS, updated signatures, went through some options, created few rules for firewall, and then rebooted. After passing windows logon screen system is totally frozen. I rebooted few more times, but no effect. I had to run into safe mode and manually delete ESS directory. AMD 64 3000+, 2G RAM, winXP sp2 32bit (no other security software installed) So I can install ESS, update signatures, make some fw rules, until first reboot. After that system hangs up (while starting) and machine is totally unusable.