Sudden unwanted auto-scroll

Hi! I have a lap-top with Vista Home Premium. Recently for no apparent
reason, certain aspects of certain programs are auto scrolling and it's
not the actual auto scroll button being on. For instance, any drop-down
box that is opened automatically scrolls to the bottom and if i try to
choose something in a higher position on the menu it automatically
scrolls down to the bottom from what I've chosen. Also, when i go into
Control Panel, Uninstall program and select a program, it them
immediately scrolls to the bottom of the page... I can't change any
setting with a drop-down box, i can't adjust the computer's volume (as
soon as i click on the volume bar, it scrolls immediately to the
bottom), and i can't uninstall a program that may be on the top half of
the menu due to this.
I've also noticed is that it won't go to screen saver or auto-sleep
mode anymore either and i can't grab the scroll bar with my mouse
pointer, but Can use my scroll button to scroll.
I have Panda Security and ran a full computer scan which turned up
nothing and i checked my mouse...
This is all i've noticed so far, but i would sure appreciate some ideas
about what may be wrong
Help!


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inana235