I don't know about an uninstall option, my guess is not one. However to
revert back
to the pre install condition you can do one of the things I suggested.
Download the Gparted, Google search and you will find it, then create a live
CD from
your download. The way to do that is you take a blank CD and burn it with
the Image
you downloaded. To burn the image you need a tool that you also download,
they are
free, again a google search will find a few, download that and execute the
file you get.
Once you have that done when you bring up Windows explorer you will have the
option
to burn images. Also some versions of Nero Burning has the ablility to burn
images.

Now here is the part you really wanted to get to, with the Gparted live CD,
put it in your
cd drive and reboot. By the way your BIOS will have to be set to have your
boot selection
to boot from CD first which is a good thing too have anyway. This is a good
time to tell you
to make sure you back up your Window application, usually means keep a copy
of your
"My Documents" folder, and any others that might have your data stored. Also
you do have
your XP recover or original load disks, right. We hope you won't need them
but this is tricky
and you need to be prepared to reload your windows if this goes south.
Remember your
Ubuntu install?
So if you have all this set you can boot from the Gparted CD which will come
up in a GUI
for the partition manager. It is very self evident of how to work it, once
it is up you will be
shown all the partitions on your disk, the one you are interested in is the
one on the extreme
left of the graft. You can click on it with the mouse and you should see the
options on the
top of the panel change or get highlighted. One of the options is to RESIZE.
This is what you
want to do resize back to the full disk or what ever you want to do.
The resize will take some time to finish so be patent. And a reboot is in
order after it is finished.

Now after going through all of that, you could just download the current
version of 10,04
of Ubuntu, I have it and have loaded it on my laptop in dual boot with
Windows Vista. This
is still a bata but is in real good shape. I have already had it update one
time. I expect it
will update again once 10.04 goes LTS on the 29th. That way you can leave
the partitions
you have already had created. The new Ubuntu will over write and recreate
what is there
now.