If you wish to use a Driver Update Tool to automate the process of installing and updating Drivers, click here to download Driver Downloader (run a free Drivers scan of your PC).
To check this, click the power icon in the top right corner. Now check if there is an 'Install updates' button (it might appear after a few seconds after the 'Checking updates' button) which can be used to update as shown below. 1: If you installed the wrong driver(or made some other mistake with installing the driver), Unity might crash or you may get "The system is running in low graphics mode" problem (or some other issue).
Whatever the problem is, you have to first delete the driver you installed.
The software also includes a Driver for AMD graphic cards.
This update also contains the latest Graphic Card Drivers.
You can choose to install the complete ATI Catalyst Control Center package from the ATI website.
If you are not tech-savvy, the easiest way to update ATI CCC is by uninstalling the older version of the program and performing a clean install of latest ATI CCC package.
After the installation process is completed, click Finish.
This should help you to get back to unity without problems.