My system was infected with Trojan last month and since then the performance of my system has become extremely bad particularly when the Internet Explorer starts (even a single windows). More I browse, more the ie instance consumes memory. Sometimes it consumes more than 200000K memory and thus the virtual memory needs to be increased. It was the same with explorer.exe, but after removing the viruses (?), the explorer.exe has stopped consuming huge memory. Please guide me to rectify this problem.