well, that is rather conscerning but, try uninstalling the graphics driver and then re-installing it:
Navigate to the device manager by right clicking my computer and selecting manage
from the device manager select display adapters
Right click the display adapter named after your graphics card and select uninstall
Run driver sweeper
to make sure that he Nvidia display drivers are completely gone
re-download and re-install the driver.
test and see if you get further blue screen problems.