while am watching videos on the web , am facing the problem as display driver stopped responding. Please help me. am using w7.
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I would suggest cleaning your system of resource wasting garbage, registry errors, and old driver remnants. Run CCleaner and do the Clean and Registry both. Reboot. Defrag. http://www.piriform.com/ccleaner/download
The "display driver stopped responding" message is probably the result of improper calls made by the browser. Depending on the browser, you should be able to disable hardware acceleration, which should fix the problem.