I recently had a lot of issues with display driver stopped responding but recovered successfully error along with my monitor just turning off and displaying weird colors when recovering and sometimes my screen would just cut out and I would have to force restart my pc to get it working again.
I would also recommend trying new drivers first but make sure to uninstall your old driver before you install new ones and check your laptop manufacturers website before just getting the newest from ati or nvidia. If that does not work and if you are a gamer try to find a game that causes your driver to stop responding for trouble shooting reasons. If your still having the issue
If you run and nvidia card there are known issues with nvidia laptop cards and windows 7. Open your nvidia control panel and under manage 3d settings on the global settings tab find power management mode and switch to prefer maximum performance. This has been know to fix some issues. If your still having the issue
Then test your memory. If it says everything is ok you may still want to test them 1 stick at a time or send it back to have them test for you. It took me a while to solve my issues and it just turned out to be 1 bad stick of memory. The only symptom I had was the display driver errors
Hope this helps