Paste function doesn't work

[Jeff Nielsen]

Before installing MSOffice XP Copy/Paste function worked
fine. I could copy an object and paste it within the same
application or into a different one. Now it still does
that, but when after copying an
object I hit one of the arrows keys (up/down/left/right)
or Home/PageUp/PageDown/End key, the object is moved over
in the clpboard list of copied objects,
and if then when I paste within MS Word or any graphic
application, I get a
picture-copy of the
entire computer screen (like the one you get after
hitting "Prnt Scrn" key).
I may have turned this feature on, by using this "Prnt
Scrn" feature couple of times, but now I don't know how
to get rid of it.
Do you have any ideas?
Thank you
Jeff