I have a Microsoft 4000 optical wireless mouse (small) for my Compaq CQ60-420 laptop. Yesterday I changed the batteries and now the mouse doesn't control the pointer. I have to use my finger on the laptop pad to manipulate the pointer and that is phyically difficult for me. I can't find the instructions on how to reset this mouse after taking out the batteries, so I'm dead in the water. Can someone give me a link or give me step by step instructions.