on this machine nod32 seems sluggish, I am using the same setting as I used to use on my XP installation. A test file I uploaded here. http://www.chrysalisnet.org/beats_NirSoft_Suite_09-12-12_x86_Addon.7z With advanced heuristics enabled it takes 40 seconds to scan. Without it still takes 15 seconds to scan. If others can test and compare for me it will be appreciated, stating if you using nod32 v2 v3 or v4 and what http scan settings you have on. I also turned off archive scan in documents since if thats enabled it scans the file twice and it can take almost 2 minutes to scan the file. Finally is there a reason why ekrn.exe is not a true 64bit service? running 32bit apps on 64bit has a performance penalty and ekrn.exe is the process that saturates cpu whilst the scan is been done.