Hi folks, I am using an old P4 (3 GHz /512 Ram) dedicated for downloads (specially torrents) I had installed AVIRA free edition - but now the rig is really terribly slow so much so that browsing is a pain. I was thinking of getting rid of AVIRA. I have Malwarebytes already installed on it. Would a combination of Malwarebytes and the KAspersky free virus scanner tool that scans only on demand - no real time protection (http://www.kaspersky.com/security-scan) be enough as long as i have a pop up blocker and browse safely? My basic requirement is to ensure that the old p4 is virus free since I transfer files from it to my Laptop (which does have Kaspersky AV installed on it)