Disk Defragmenter not installed

> I had my computer for about a year. I decided to do a
> disk defrag. I took the route MY Computer - Open - C: -
> Properies - tools - Defragment now and it indicated "The
> disk defragmenter is not installed on your computer".
> Then gave me instruction on how to install it.
> "double click the add or remove programs icon in the
> control panel"
> "click the install / uninstall tab and follow directions"
>
> The problem is there is no install/uninstall tab in
> add/remove programs in Windows XP Home. If I try to run
> Disk Defrag by another route I get the message " cannot
> access device, file or path . Does anyone know how to
> install Disk Defragmenter with me having to reload the
> the Windows XP. I still can't figure out why it didn't
> not install with the other tools during Operating System
> install.
>
> I would appreciate any help I can get, thanks.
>
> Mark
>
>