All my games freeze and crash to desktop plz help

Problem Event Name: AppHangB1
Application Name: moh_spearhead.exe
A problem caused this program to stop interacting with Windows.

Well after looking on so many threads and forums i have still not found a solution to why my games seem to crash like after 10mins of play, even whats more strange i can be playing for over an hour sometimes and it will do the same again, its becoming very frustrating for me. I've read it could be either a hardware or software problem, all my drivers are up too date i think. I've done a memory diagnostic test did not find any errors. Another thread i was reading said it's Direct x related.
Had this problem with ati cards before, thinking of switching back to nvida because of personnel experiences, they seem more stable. I built my new computer myself back in January of this year, i am from the uk and would really appreciate some help please. I will post screen shots if needed so, anymore information you need feel free to ask :-)

My specs are as follows:

AMD Athlon II X4 640 Processor 3.0GHz
4GB DDR3 1600MHz
PSU: OCZ 700 Watt
AMD Radeon HD 6790 (1GB)
Asus M5A78L-USB3
Speakers (High Definition Audio Device)
Operating System: Windows 7 Ultimate 64-bit SP1

My cpu temps at idle are 33c and when gaming i never see it go pass the 50 mark!
Gpu temps idle at 50c and when gaming i never seen it go over 65 mark, but i did a stress test while running a benchmark and it went as high as 72c!!

I've read many comments on threads that the hd 6790 is just not a very good card, i am looking into buying an alternative card (don't know if this will fix my problems) if anyone has any suggestions what would suit my system best, i play games like battlefield 3, skyrim, batman arkham city, crysis, some older games to like the old medal of honor games and call of duty games.
3 answers Last reply
More about games freeze crash desktop help
  1. 7850 would be a decent upgrade..... it could be the fault of the drivers
  2. i am currently using Catalyst drivers 12.4 which is the most up too date.. i have also been on the asus website and downloaded chipset drivers for there any program i can use which will tell me if everything is up too date?..
  3. 7850 is abit expensive £208 i been looking at the 560ti its only £160 better value/for performance.
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