Few things here:
uninstall whatever video driver you're using before undertaking a BIOS flash. Use control panel/add-remove programs to uninstall. Then reboot into safe mode and run Driver Cleaner
. Follow the instructions after you've installed that software. If you do this, there will be no need to remove anything via device manager.
Regarding drivers, Dell gave you misinformation (color me surprised
). It's technically their responsibility to provide the drivers for your laptop's video chipset. The only support provided officially by NVIDIA is for the GeForce Go 7800 and 7900 GTX cards. Additionally, the site LaptopVideo2Go
modifies NVIDIA's drivers to be compatible with all desktop and notebook chipsets. Directions for installing the modified drivers are available on that site.