Based on the problem description I would say the problem is not related to the Graphics controller on the system but the hardware and software you have in the computer. My recommendation is to make sure the antivirus in your computer is active and updated in case there is malware on your computer causing this problems.
In any case, If you would like to install the latest graphics driver for your system, you can download it at this link:
If you have problems installing the driver, try the steps mentioned here:
It is extremely important to say that the driver above is generic for your computer so if your computer has special features you may loss these features by installing our driver. It is always important to install the driver from the Computer Manufacture first.