Or at least I believe it is the same problem.
I bought my wife a Dell XPS Studio 16 for Christmas and it seems to work fine on everything except farmville where after a minute or two the screen would turn white and the entire computer would lock up. I tried updating all the drivers
and the bios, no luck. Tried using IE (yuck) no luck. Did a clean reinstall of Win 7, no luck. I did somewhat relieve the problem by finding the newest beta version of flash. Now, instead of the whole computer crashing, just the browser crashes and since I have firefox set to reopen with the same tabs it seems to bounce right back to where it was before it crashed. Does this constantly so I'm hoping you found a solution. Near as I can tell this problem is always limited to farmville, hulu and a couple of other flash sites work great.
Dell XPS Studio 16
Windows 7 64bit Home Premium
Using 32bit browser
ATI Mobility RADEON HD 4670 1GB
Intel Core i7 720QM 1.6GHz (2.8 GHz Turbo Mode, 6MB Cache)