navigate:
start>control panel> add/remove and in add/remove select the "add/remove windows components" tab when it comes up then look for OE and if it is checked...then uncheck it. If it is unchecked,then check it. then hit next and let the wizard uninstall the program.
Reboot
Now renavigate back and then either check or uncheck the box to have it reinstalled. You will need your xp install disc so have it handy.