The Intel graphics is actually built in to the processor (Core i3-i5-i7) and you must install the Intel Driver first.
The 310m chip is always secondary graphics so you must install the nVidia driver after.
If you are updating a driver it is a good idea, and sometimes necessary, to do a clean install (of the drivers).
This is accomplished by
- Uninstalling all graphics programs from the Programs list in Control Panel - uninstalling the driver last.
- Delete or move any folders with the nVidia drivers.
- Then restart.
- When Windows restarts it will install it's own driver. You will be asked to restart again. Do it.
- When you get back to the desktop you can then install the Intel Driver > restart
- When you get back to the desktop you can then install the nVidia Driver
If your troubles started when you installed a newer driver, then only install the older driver.