getting rid of downloaded Windows Update

Using WinXP. I downloaded and installed some Windows Updates that screwed
things up on my computer. I did a System Restore to before the downloads.
However, the updates remain on my computer; as Windows Updates keeps telling
me, they're downloaded but not installed.

Is there a way to get rid of them entirely--to return the computer to its
state before the updates were downloaded?

Thank you!

Jo-Anne