Has anyone of you send your Vaio for warranty b4? If yes, what is the problem?

Anyone knows if a Vaio's warranty can be extend if the unit is still within the warranty period?

Like HP/Compaq, as long as the unit is within warranty period, I can extend it, the most is 3 years. Include the official warranty.

Means if I buy from third party dealer which doesn't provide extend warranty service, then I can't extend it anymore?

Any one using cw16 and get blue screen?

I got it many times already, like once a week on average, I wonder what is wrong? My friend said his Toshiba is acting like that as well, using same operating system, 64 bit Win7 home premium, he reformat a few times, problem still exist, so he install a 32 bit win7 ultimate and problem solve, I wonder why?