I too am having the freezing problem with XP SP3 and NOD32 5.0.95. Like cfk41 (reply no 56), I believe the problem started with v126.96.36.199. But 5.0.95 has not solved it. Most times, the system does not freeze when one or more external USB drives are connected. Perhaps one time in five or six, the system will freeze. To me, this suggests a conflict between NOD32 and another driver which depends on the order in which drivers are loaded as this would vary. ESET NOD32 188.8.131.52 was installed by the full uninstall and clean re-install following precisely the procedure described in http://kb.eset.com/esetkb/index?page=content&id=SOLN2854&ref=wsf The system has no other AV, firewall or anti-malware software. It does not have InCD and never has, nor any of the other known incompatible software referred to elsewhere in this thread. I generated a memory dump by the CTRL scroll-lock (x2) method when the system had frozen after connecting the external USB drive. I have uploaded my memory dump, compressed by zip, to my webspace with a report of my full system configuration and a textfile description of the problem. If the forum software allows me to, I am sending my upload link to Marcos by PM. I hope this will enable ESET to investigate.