Re: problem with the Pc that i don't know what is it till now
your sudden shut down could be the power supply or a overheating issue.
the BSOD could be a result of the overheating, or an other hardware problem, for instance a bad RAM module.
as for the RAM, the colored slots are for each channel, you use the same colored slots first and use the same two sticks of RAM in those two same color slots. you can use a different size of RAM for the other two color slots but they should be the same speed. But each color should have the same two sticks.
Asus M4A88T-M/USB3<>PhenomII X4 965e<>Asus ENGTX460
Seagate 320GB/1TB<>Win7 Ulti 64Bit<>Antec900
SyncMaster 2220WM<>HyperX 16gb<>Cooler Master 600W