uninstall nvidia drivers (display only if you get the option) via add remove programs.
type 'regedit' in orb start window, right click delete nvidia corp entries in h_key> current user.
do the same in h_key local machine.
reboot, delete nvidia folder from c> programs.
you should now be running on vista vga driver.
download click here and run as admin to install
most stopped responding errors are due to misdirection caused by poorly un~installed drivers.
good luck let us know if this works.