Upgrading your version of Internet Explorer from 4 to 5 on Windows NT appears to work correctly when you perform the function with administrator access but when you log back on as an ordinary user, you get an error message as IE attempts to start up a tour that no longer exists.
To fix this problem requires that you edit the registry to delete an entry that the upgrade left behind (did someone say Microsoft bug?).
Click the Start button and select Run. Type in Regedit to start the registry editor.
Now you need to go toHKEY_LOCAL_MACHINE
and completely remove the BrowserWebCheck entry (don't just clear the field contents).
This article written by Stephen Chapman, Felgall Pty Ltd.