Blue Screen's help

So this are some of the blue screen codes that i get (there were others... )
0x1000009c MACHINE_CHECK_EXCEPTION
0x1000007A KERNEL_DATA_INPAGE_ERROR
0x1000007F
I just wanted to write a dvd and when it started spining ... BAM blue screen 0x100000F4

This started kinda after i purchased my new video card and memory
Now , I only get these blue screen after my comp has been on a long time and 90% of the times in games


Memory
I tested my memory with Windows Memory Diagnostic 2 times and it turned out ok ....

Hard drives
I tested my 2 hard drives 1 turned out ok (the older Maxtor) , the other(WDC) had bad sectors when i did the extended test ,the quick test turned out ok ...

Also sometimes the hard drive (i think it is the hard dive ,don't know anything else that i can hear shut down )shuts down for 1 sec and restarts again , followed (after a few min) by a blue screen ,sometimes no blue screen will appear , but i'm not sure its the hard drive . I have to say that first this didn't happen , there were only blue screens .

Video Card
There is something else i think it might be , i don't know if my power source is powerful enough (what i read about the video card it isn't enough ... ), sometimes when i turn the computer on there is no image on the screen just an a image flashing from time to time ,so i have to restart ,

Virus
I rad some antivirus tests with Nod32 and Kaspersky but not on all partitions mainly on the one where windows was turned out ok ,i reinstalled windows also ...


Temperatures are ok ...

6.dunno if this helps this is when i alt -tabed out of a game



So if someone could help me pls i would appreciate it , thx in advance

System
CPU: AMD Athlon 64 3000+ ,1800 mhz
video card:NVIDIA GeForce 9600 GT
3 memory : all kingmax , 1 is 1gb the other 2 are 256 ^_^
2 hard drives : 1 maxtor 40 gb ^_^ and WDC 200 and something
Power source is 420-450 i think , don't think its true power ...