How can I make my touchpad mouse work in Acer Aspire 5100?

The touchpad mouse stopped working, after I tried watching an mpg CD which apparently was malfunctioning. Now, the only time it works is for 4-5 sec after I press the enable/disable options in Control Panel/Mouse/device section. There's no conflict reported in the Control Panel/Mouse section, and it reports that the device is functioning properly, but it does not function at all. I tried uninstalling it and updating the software, but reported that the software was up to date, and this method did not work either. What shall I do to make it work again?ACER-ASPIRE 5100, VISTA