nv4 dll error usually indicates the driver install corrupted
in the device manager uninstall the card
reboot tapping f8 and choose vga mode
when windows finishes reinstalling the card
disable a/virus
install your drivers
reboot the computer
in the device manager uninstall the card
reboot tapping f8 and choose vga mode
when windows finishes reinstalling the card
disable a/virus
install your drivers
reboot the computer