It just happened sometimes that I have got IE opening too many windows continuously on its own, until I killed the IE application by task manager. My system is clean. It happened usually when I clicked IE to open, there was some delay and I double-clicked IE multiple times, that triggered this crazy behaviour by IE. I noted this phenomenon on my friend,s desktop. At that time Norton found some bug and wanted to delete it, and I tried to stop Norton from it( the bug was infact not dangerous as I think). Then Norton opened the symantec site with IE and IE showed the same behaviour. But my case was different as I told.