All this day I was thinking about which AV to choose from these two: Kaspersky or Norton. All ppl who said that Kasp is mush better were right . My problem for 2 days was very slow work of browsers ( Opera and IE7) but as I installed Kasp ( initially deleted Norton ) and initiated Kasp Scan I suddenly felt increasing of speed of my browsers . Kasp deleted 39 trojans and viruses that suddenly occupied my PC ( I think my Internet provider was attacked ) . Norton was dreaming all this time / Also tried AVG -this free prog made a scan during 5 hours and finally got stuck / Kasp is the best /