Can't Install Explorer SP1

[Dave]

When I try to install Explorer SP1, I get the message, a
previous installation has pending work requiring a reboot,
and that I should restart my computer before running IE
setup.

When I restart my computer, nothing has changed. I still
get the same message, re. previous installation. Is there
anything that will override the message, or do I have to
remove the old version of Explorer before installing
version 6?

 

[war17]

You need to edit the registry to reinstall IE in Windows XP

Reinstall or Repair Internet Explorer and Outlook Express in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;EN-US;318378
OR
http://www.theeldergeek.com/repair_ie6.htm