I ran a Google search of the warning message you received in your taskbar and it returned numerous instances of other people experiencing the same, or similar issues.
One of the links I found comes directly from Microsoft:
"Display driver stopped responding and has recovered" error in Windows 7 or Windows Vista"
Your PC may temporarily hang or become unresponsive, and you receive the following error message:
Display driver stopped responding and has recovered
This behavior can occur for one or more of the following reasons:
You may need to install the latest updates for your display driver
Visual effects, or too many programs running in the background may be slowing your PC down
The GPU is taking more time than permitted to display graphics to your monitor
Note: If you are using an older video card, there may not be a video driver that is fully compatible with your version of Windows.
If you scroll down on the page, you will see two options for fixing the problem - one entails doing it yourself by editing he registry - but the second option offers a "Fix it for me" option, which you can try. Click on the Fix It icon and either run it directly, or save it to your desktop and run it manually.
See if this helps, and please let us know.