my windows vista has bar which grabs pointer

Any time I am using my Compaq laptop, at random, this vertical rectangular bar can seize control of my pointer. When it does this, my pointer moves a thousand miles/hour until I let go of the mouse and move my pointer an inch away from the spot on the screen where this little(1/4"tall) vertical pesky rectangle with horizinal black stripes inside this black rectangle grabbed control of my pointer. DAMN IT IT JUST GRABBED MY POINTER JUST THEN AND MOVED MY WHOLE PAGE 6". It does not do this all the time. But if I am doing any function(typing, searching,...) long enough this little accelerator rectangle will grab control of my pointer without warning and DRIVE ME NUTS!!

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