No where we can find IE8 used in Win 7. @Drew, the IE8 for Vista doesnt install on Win 7. The best way to re-install IE8 is as follows,
Goto Control Panel - Programs and Features - Turn on or off Windows features - Uncheck IE8 and reboot. After reboot, follow the same steps to re-install.
Note: I tried this, but IE8 is not displayed in my RC. But, this is the only way to re-install IE8 in Win 7 as adviced by many MVP.