How to update my graphic cards?

Your laptop is an entry level model with poor graphics. Unfortunately, laptop graphics are not upgrade-able. You could trade your laptop in on a better model.

There's a way to make Windows 8 look like Windows 7. Do that then follow the following instructions.

1) Press the start button and go to Control Panel. At the top right corner of the screen you should see a "view by" selection. If it's not set to large icons do so.
2) Click on "Device manager". In this menu you should see a section called "Display adapters" click on it.
3) Now right click on the video card shown and select "Update Driver Software".
4) Then select Search automatically. If Windows 7 found a driver, restart your computer.
5) To update the drivers manually, write down the name of the video card from the "Device manager" menu under "Display adapters".
6) Go to the manufacturer's website.
7) Search for a Driver or Download section.
8) Enter your video card's information.
9) Download the driver to a location you will remember.
10) Run your download from the selected location and follow the on screen instructions.
11) Restart Your computer.