Free scanners work to a certain point.
You should never wonder why you got a vrius if you use free software,it does only part of the job.
I used both AVG and Avast,got two trojans that they didnt even see...and they both make mistakes by identifying applications as malware or other ware.According to Avast GTA4 has a worm,crazy...
I introduced the trojan on my laptop,which has ESET smart security..immediate recognition!
So i use ESET now,much lighter on the processes,very much running without you even knowing it.
A good scanner should update at least 4 times a day,the free ones dont even update twice a day..
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