BSOD multiple times during day

Im running with 2 slots.

When i was playing left 4 dead 2(5 mins ago) my pc restarted itself then on windows my pc froze. I restarted my pc it froze during boot screen. I changed ram slots now sometimes i cant get any visual or sometimes it freezes on "windows error recovery" screen. Restarts itself. Something weird is happening help me.
Video: https://www.youtube.com/watch?v=KNHbTZOIt2A&feature=youtube_gdata_player
 

My Computer My Computer

Computer type
PC/Desktop
OS
Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
CPU
AMD Phenom(tm) II X6 1055T Processor
Motherboard
ASUSTeK Computer INC. M4A87TD/USB3
Memory
6,00 GB
Graphics Card(s)
AMD Radeon HD 5800 Series
Sound Card
(1) Razer Surround Audio Controller (2) High Definition Au
Screen Resolution
1920 x 1080 x 32 bits (4294967296 colors) @ 60 Hz
Hard Drives
(1) ST31000528AS ATA Device (2) Kingston DataTraveler G2 USB Device
Browser
Chrome
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