windows 7 - Video driver (I think) causes computer to freeze up, then continue

Laptop: Dell Studio XPS1340; Intel Core 2 Duo P8600 @2.4GHz; 8GB RAM; Intel 120GB SSD SC2BW120A4

GPU: (stock) NVIDIA GeForce 9400M G, Driver Version 340.52 (up-to-date) [more info avail if needed]

Question: Occasionally when watching YouTube videos or playing StarCraft 2, the display will freeze - not changing at all - and the sound will either freeze with it (causing a single, jarring sound), or proceed really slowly (approx. x16 slower). After 1-3 minutes, it flickers and then continues on as if nothing happens. Only occasionally do I get a pop-up in the taskbar stating that the video driver was restarted. The entire computer becomes unresponsive, and I even get booted from games (from no networking).

I do not remember this happening before I switched to SSD. I thought it was a faulty Crucial drive, but the issue persists with the Intel drive. If not SSD related, is there anything I can do to prevent this from happening video-driver-wise?

Thank you for your help!

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