I am having the same issue but with the latest version 3.0.657 and I just sent a Filemon log to ESET to have them check it out. My system just locked up due to the EKRN.EXE file using up most of my CPU power. I have a Thinkpad T61 laptop running Windows XP SP3 with 3GB of RAM and a Core Duo T7250. It uses up most of the CPU and when you kill the ekrn.exe process it frees up for a few seconds then starts scanning again. I had to delete some files that ESET itself was creating in the C:\Windows\Temp directory before it finally stopped scanning and allowed me to work on my system. This needs to be addressed otherwise I may need to revert back to 2.7 for now.