updates

[Debbie]

When I went through my update history, I found some of
the updates have been installed more than once. Since I
don't need more than one of them installed, is it
possible to delete the others if they don't show up in my
add\remove programs program under my control panel. I
have windows xp. If they can't be deleted, does it make a
difference in the performance of the computer. It seems
to be running slower, although I have more imformation
loaded than when I first bought the computer, which may
attribute to that problem. Thank you.Debbie