I am sorry to hear you are having this problem with the system but let me help you.
Based on the information you posted I would like you to do some steps in your computer:
- If you are doing a clean installation of the Operating System, please install the latest driver for your graphics controller that can be downloaded here:
- If you get a notification message during the installation, it indicates that your computer manufacturer does not allow the installation of generic Intel video drives. You are required to install drivers from your computer manufacturer.
You may try to force the installation of Intel generic drivers by performing manual procedure, see here for instructions:
Here is the zip version of the video driver:
Since you computer comes with the Intel® HD onboard graphics and an external video card (switchable graphics configuration) your system may need special drivers designed and created by Toshiba so in the case the steps below do not work I recommend you trying installing the original Operating System that came on a disk with your computer. By doing this may be possible to discard compatibility issues between the software and hardware in your computer.
I came across this exchange when researching a broadly similar problem. The Windows maintenance dialog box asked to update the graphics driver. I did so, went through the install process, but on restart the update seems to have hung. The screen just gives the "Keep your PC on until this is done | Installing update 1 of 1" message. It has been doing this for well over an hour. Even though I was reluctant, I tried the on/off button anyway to see if that would shake it out of the hang, (only for a short time) but it just comes back on where it was, on that screen with the revolving dots.
Intel(r) HD Graphics 4000
ASUS F550C Laptop
CPU: Intel Core i7 - 3537U, 2.0 GHz, 4gb memory
NVIDIA GEFORCE 720m
Win8 (can't tell/recall whether this has updated to 8.1, can't get the computer to start-up to check)
Anything I might try to break this out of its hang?
I understand. In this case I recommend you trying to access Safe mode and uninstall the driver to start all over again. In case you are still having problems after uninstalling the driver, the best option would be to contact the Computer Manufacture so they can provide more steps on this situation or proceed with warranty.