Solution for the error "the requested look up key was not found in any activation context"

This is a common error in IE 7. Due to this error it also blocks the activation of Windows XP.

I had to do these steps to resolve the error.

1) Uninstall IE 6 through Add/Remove Window Components
2) Delete IE7 folder from C:\Windows (This folder is hidden)
3) Use firefox to install and download IE8
4) Navigate to C:\Program Files\Internet Explorer and create the shortcut key for
iexplore.exe on the dekstop
5) When you double click IE8 shortcut, it will give you the options to open the
internet explorer with and without Add-ons. Choose the option to open the
internet explorer without Add-ons and set it as default.

Hope this works for you guys.