|I got this too as a result of accidentally downloading AntiVirus8, a scam trojan program. Follow the directions you'll find online for removing AV8, then to remove the installed iesafemode.exe:|
(a) Use Windows Explorer, and do a search for iesafemode.exe in all directories and remove any files with this name.
(b) Use the registry editor (carefully) as follows: Search for any occurrences of "iesafemode". For each, if it's a Key, delete it. If it's a Value, simply change it to null, ie select the text and press BackSpace. You'll likely find several occurrences under the Debugger keys of all common browsers.
(c) if you use Firefox, check the file called "all.js" in one of its directories. Use Notepad and check to see if a line has been added to the end - something with "WinNT-A8I". If so, delete this line and save it.
(d) Don't forget to follow the other instructions at Spywarevoid.com and other sites if you have the AntiVirus8 trojan.