it take high cpu usage .. can we control cpu usage .
For this problem, you probably need "HotFix HF539488 (EngineServer.exe)":
http://scforum.info/index.php/topic,4347.0.html Don't worry, I'll send you download link via PM.

maximum protection does not work properly.
ex: USB open without scanning after some days it affect os
even older virus also, solved from McAfee and Microsoft..
After some day we scan our system it find virus in system and roster point
it is vulnerable for solved virus
For this problem with USB sticks, my recommendation is "Panda USB Vaccine":
http://scforum.info/index.php/topic,4274.0.html If you try, please post your opinion (experience) in mentioned Topic.