home page worm

my home page on internet explorer keeps being reset to a pornsite and links are being added to my favourites. each time, i change the home page and delete the naughty links, but they keep being put back there when the pc reboots. i ran avast and no virus was found. any ideas?

this is spyware or homepage hyjacking. try Spyware: Search and Destroy to get rid of the problem…