moving mouse works like show desktop

[Guest]

Ive had this problem for awhile now... whenever I move my mouse quickly to
the top center of the screen all windows are minimized as if i had clicked
""show desktop" If i back away and do it again they are restored... just as
if I had clicked it again!! Sometimes if i move the mouse really fast back
and forth in the middle of the screen, or sometimes in places and ways im not
really noticing... itll do the same thing... any ideas here?? Its doing it on
several workstations on my network... Ive told them it was a "boss" button to
quickly minimize anything you shouldnt be doing... but I am truly perplexed
and would like to know. help!
Every station runs WinXP, SP2 with all current updates...
Thanks!

 

[Guest]

Start>Control Panel>Mouse>Pointer Options tab
Reset the Mouse speed, try Slower first, one click to the left.
Also make sure Enhance Pointer Precision block is checked.
Click Apply and OK.

 

[Guest]

Nope... tried it all the way down and even unchecked enhance precision... but
still when i move it to that certain spot top center of the screen its like
clicking show desktop... any other ideas??