Help with my system's BSOD please

[lxgddv]

Hello,

recently (2 weeks) I bought a new computer, which I put together myself. Now every now and then I get the very frustrating BSOD's.

my system:
Windows 7 Ultimate
i5 760
asus p7p55d LE
4 GB (2x2GB) ram Kingston DDR3-1333 Hyper X (KHX1333C7D3K2/4GX)
Asus, Nvidia ENGTS 250 1GB
Seagate ST31500341AS (1TB)
620 Watt

I could not find any consitancy in the crashes. It happens once every day or the next. I tried like suggested on the internet to memorycheck. It has passed fine. Also the chckdsk seems to give no errors. I have no clue what to do.
The pc I use alot for editing so when I get the BSOD its very frustrating, because last time I lost a lot of work..
I will add the zip with memory dumps from the minidump folder
help would be appriecated alot!!!!

 

[lxgddv]

someone?? please, the problem is still persisting and i cant find anything else on the net + cant figure it out myself
Last time it crashed i was switching between tabs in Mozilla 3.6.8 while entering my search in google.
Btw i have win 7 ultimate x64