Actually I'm not sure whether the following problem is related to shortcut
key or not. Normally, when you press CTRL-F in an excel worksheet, it will
bring up the find & replace function. But some of my user complained that
their worksheet runs some strange macro when CTRL-F is pressed (I have no
idea what function is running behind, I also have no idea what the user have
done to their PC). I have checked there is no marco coding for the worksheet
in problem. Even if I open a blank worksheet and press CTRL-F, some strange
function is executed other then the find & replace function.

How can I reset the original shortcut key function for excel?

thanks!