win 7 keeps crashing

Hello, I've recently installed a windows 7 64-bit version.
Updated drivers from manufacturer's site (video,sound,chipset)
and installed a game for some performance check ( Call Of Duty 4.)
after maximum 30 minutes of playing it the pc freezes and a reboot is needed.
(as i mentioned at the beginning, drivers ARE updated.)
And its not a heat problem as-well, how do i fix this?

The OS is WIN7 Ultimate x64
files are attached.

badkarma11 said:

I had similar lockup issues that turned out to be hardware related. I would suggest opening up the case and at least re-seating the RAM. Please fill in your system specs so we know what hardware you've got. You can do it through the user control panel (click on your user name at the top of the page where it says 'Welcome vald95'. Welcome to the forum.

Are you sure that its all finally comes down and ends with the RAM re-seat?
(Its the 2nd day im trying to solve this prob [consecutively])
Do you really think it can help?

Maguscreed said:

ugh did you have to use zipx on the dump files?
Oh well, someone else will have to check it for you I'm not installing that nightmare called winzip just for one file. ...nothing personal against you, I just hate winzip.

lol are you kidding me?
there's a threat at the sticky which says to attach the dmp as ZIP files.

added system specs :)

Maguscreed said:

zip I can extract with anything, (support is actually built into windows with pro or better) zipx requires winzip.

so make a little effort (;

if i aint able to play games properly without the BSOD's but my pc works fine when im working on the desktop and stuff, is it possible that the memory is damaged, (im a little confused 'cause i AM able to work when the pc isnt making effort)
or is it just some bug that will be fixed as soon as i re-seat the sticks? will 'memtest86+' help to diagnose before opening the case?