>>HOW DO I KNOW IF MY SYSTEM IS INFECTED WITH VIRUS-

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First time ownig a pc -------i'm online already for a few weeks, now i want
to install antivirus software before i do how do i know if my pc is infected,
if there is how can i remove it.(my new pc come with-norton-int'-security-
install already,can i check it with this software)
Thanks inadvance.
.