I don't have iexplore.exe in my task manager. I have explorer.exe, but then I also don't use IE as a browser.
I found this when searching for muliple iexplore.exe in task manager.
Backdoor.Tofger
http://securityresponse.symantec.com...fger.html?Open

W32.Hostidel.Trojan.B
http://securityresponse.symantec.com...an.b.html?Open

as to be the likely cause. This came from here