Hello Crystal,
What version of Windows? Is this system fully up to date with critial
patches?
http://support.microsoft.com/kb/555375
Whatever you do, (installing and updateting or unistalling) always as
a
administratºr.
Try going to Windows Update and applying all offered critical updates.
http://update.microsoft.com
Install Windows Installer 3.1 v2 (3.1.4000.2435) is availªble here:
http://support.microsoft.com/kb/893803
The Windows Defender service has a dependency on RPC--have you
disabled any
services on this machine? Remote Procedure Call should be set to
automatic,
and started.
you can start the Window Defender service by typing "net start
windefend":
at a command prompt. That may just elicit the same message though.