Originally Posted by hackerumas
why my computer become slow when Install Antivirus example kaspersky or Norton ?
well antivirus runs in the background and he uses some resources (still not that much to "slow down")
check if the antivirus is running a system scan in the backgroud (hdd works hard even during idle). to find this out just right click the antivir icon in the notification aerea ( near the system clock) and open the antivir interface ( diferent names depending on the software). there you should find something depicting the progres of the scan (if any).
if that is not the case, i gues its time for an upgrade/new system