Windows 7 computers are pre-installed with touchpads that act as mice. The Synaptics Pointing Device driver becomes corrupt or interferes with another mouse that you are using. If this occurs, one option is to uninstall the Synaptics Pointing Device driver. Be warned that this will render the touchpad unusable, but you can always reinstall the driver later if you decide you need it.
1). Go to "Start" and type the command "devmgmt.msc" in the blank box above the "Start" button. Press the "Enter" key. This will bring up the Device Management box.
4). Right-click on "Synaptics Pointing Device" and choose "Uninstall" from the list of options.
5). Click "OK" and wait for the driver to uninstall.
6). Restart your PC when the driver is finished removing itself.