This is your processor:
It is a Haswell processor, not Sandy Bridge.
You can find the latest driver for your Intel HD 4600 Graphics here:
The IDUU is intended for Intel boards, so you can not expect correct results.
Now, the driver link I provided is for your graphics. However, since it is unknown what the state of your graphics is due to incorrect installs, it still may not work. You may be required to remove all previous installations and then install the driver I provided. However, you probably should be using the driver from the Toshiba website for your laptop, in case any customizations were made by Toshiba.