I have a problem similar to pabarbara
I looked at How to Repair Internet Explorer
I ran "sfc /scannow", and it ran without incident. I edited the registry mark IE as "uninstalled", but I have not been able to get it reinstall - the only pages I can find at for updates to IE6, and they all say that I have a more recent version already installed.
I have adware and virus protection from AOL; they pronounce the system clean.