Method 1.
I recommend you to uninstall/reinstall the display adapter driver and check. Follow the below steps:
Press Windows key + X and click on Device manager.
Locate for display adapter and click on it to expand.
Right click on the device and click on uninstall.
Once you are done uninstalling the driver, restart the computer. It will automatically install the generic display adapter driver.
If this doesn’t help to fix the issue. I suggest you to update the display adapter driver. Skip step3 from the above steps and right click on the device and click on update.
Method 2.
If the above method did not help to fix the issue, I would recommend you to go to the below link and click on Drivers & updates, select appropriate windows version and download the latest updated VGA driver and install the same.
http://support.toshiba.com/support/modelHome?freeText=1200008322