What does the message say? What version IE? (Open .. Help/about)
First do a FULL scan with System Restore TURNED OFF.
Then a full scan with Malwarebytes Anti-malware.
Then .. after reboot after any fixing, re-enable System Restore.
If IE8 on XP and 32bit Operating System (Check in Control Panel/System .. read off version) use this link ..
http://www.softwarepa...ecurity-download.html Download and re-install. If another version .. or 64bit, look/search in Microsoft website for the download.