windows 7 crashing

Windows 7 Home Premium (x64) Service Pack 1 (build 7601)
3.60 gigahertz AMD FX-4100 Quad-Core
8176 Megabytes Usable Installed Memory
Board: ASRock N68-VS3 FX
AMD Radeon HD 6670 [Display adapter]
Hi all hope im doing this right,above is some info from belarc if you need more let me know,my problem is my pc is crashing i dont think it is software but aint got a clue to be honest it seems to only crash when kids are on it using a game i never have any problems with it,it has crashed on sims 3,minecraft and on monster legends a facebook game,pc gives no warning at all just powers down im wondering if it is a problem to do with graphics card or over heating?or something else completely any help would be great hate having to keep the kids off it lol

 

yep for def need help with that found where to make the dump file but what path do i save it to?

 

i got the message Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.

No valid crash dumps have been found on your computer

 

i dont even get a warning when i crash so shall i run that who crashed prog as soon as it happens odd time it doesnt go down for a week or two,should i get a game running a push it into crashing?

 

ok son just tried minecraft again got it on few minutes then gone hole thing shut down,as soon as i got it back on i ran who crashed and it gave me the same message
Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.

No valid crash dumps have been found on your computer
Going to try the crash dump test see if something set up wrong try narrow it down a bit

 

I have never once had a bsod on this pc till i just did the test on who crashed,think i had a wth moment wasnt expecting it so didnt see the error,dontknow if i need to give u what it said when got back up and running but here it is anyway
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 2057
On Tue 10/06/2014 21:26:54 GMT your computer crashed
crash dump file: C:\Windows\Minidump\061014-20857-01.dmp
This was probably caused by the following module: rspcrash64.sys (rspCrash64+0x108B)
Bugcheck code: 0xDEADDEAD (0x0, 0x0, 0x18EA5109, 0x3C2A58ED)
Error: MANUALLY_INITIATED_CRASH1
file path: C:\Windows\system32\drivers\rspcrash64.sys
product: WhoCrashed
company: Resplendence Software Projects Sp.
description: Resplendence WhoCrashed Crash Dump Test
Bug check description: This indicates that the user deliberately initiated a crash dump from either the kernel debugger or the keyboard.
This bug check belongs to the crash dump test that you have performed with WhoCrashed or other software. It means that a crash dump file was properly written out.

So who crashed and the file dump is working?i just dont understand why its not giving me a dump file when it crashes by itself?sims 3 i know can push it but minecraft i ran that on my old xp with 500 ram lol why would it cripple a quad core something def seems off

 

No have never used xp mode,have never thought to downgrade it as such didnt think should have had too for the amount of times kids are on it normally i dont have that many crashes like once a week or less but today have had 3 although 1 was forced,gona take her apart tonight make sure nowt loose and nothing to dusty

 

is there a way for me to check/test if its the card?

 

Have just crashed twice within 15 minutes,when i ran the who crashed app its only giving me the results of the time we force crashed it a week ago how do i check if its over heating its been real warm here last 2 days