I don't know if this has relevance to any having speed issues and CPU high running after updating to .657 and then getting hit with the sig fiasco later. I followed Eset's recommended way to recover but noticed on each load I was getting a *.dat file in my temp folder, as I am temp sensitive I knew this *.dat file was new and being created by something new in the past 24 hours, it also took a long time to delete it. Running task manager I noticed that every time I selected this particular dat file ekrn.exe went to the top of the stack and ran at 70 to 100% forever... My only solution was a complete uninstall of ESS including registry sweep and deletion of all folders then a new install. Now things are back to normal. As I say, this may be my machine specific, but if you see a foreign dat file in your temp folder this may be causing your speed and performace issues.