Hello ,
I just reinstall my windows (Windows 7 64bit)
(Pentium(R) Dual-Core CPU E5500 @2.80GHz 2.79GHz)
(2.00GB RAM)
(Intel(R) G41 Express Chipset)
and I run my game that contains a video at the beginning,
It crash.
So I install Unity and open my project,
and I found that if I play every video in preview (at the bottom of Inspector)
Unity must crash.
I installed K-Lite Mega Coded Package 1.7 and It still crash~
someone help me? 
installing codecs won’t help. Unity only supports ogg theora, the other formats you can put in are converted to it which happens when you drop it in.
Unity shouldn’t create later on, if it would crash then when you drop it in normally when the conversion process should run out of ram due to a too high res movie being too long, which does not seem to be the case
I dont think its res problem, the videos have not large size.
and the built game is output from the other computer that can work fine.
(I can play ogg videos outside of unity3d.)
reinstalled vista x64 now,
same problem…
hardware problem?.. 