My friend has a Dell Optiplex system. He is using Windows XP on the same. Recently due to some virus infection he called to check the system. I installed Spybot and cleaned the system. There is a antimalware. On scanning there were few infections, but later on nothing was detected. So it looks that the virus is clean. But a new problem appeared. When the system starts up there is a sound. I checked in Task Manager and found iexplorer.exe as running which is consuming quiet high cpu and ram. What I know that iexplorer is for Internet Explorer. If I terminate the same the audio goes, but the system freezes. How can I stop this thing. I am having no clue about this infection.