mouse pad ,quick launch buttons and volume /sound not working!!!

I am using Vista ,,but my mouse pad is not working ...following error is shown in device manager,,,this is when i click on 'show hidden devices'

windows also shows an update for the synaptics but once I try to update ,,i get error update failed..


please help...also my sound device is not working,,though when i pplay any music...i can see the some movements in my sound taskbar ....pls give any solution

one thing to note is that ...this all happened after some graphics chipset repair..caused by short circuit during replacing of screen of the laptop.