[Rehan]

@arsalahmed786 i have not used any antivirus for internet security.For common threats like USB or any other software i use Smadav.That is a lite antivirus and works very well for common viruses.
If you want to use a internet security software then i should recommend you to use Panda.I don't know about their latest versions but i still use 2010 version.I simply update and it works very well for a month.