Problem with my VGA Help me please

hi guys ! how u doing ? recently ive bought my new gaming rig
Components :
Motherboard : Asus Ex-58 EXTREME RAMPAGE II
Processor : Intel Core i7 920 2.66
Power Supply : Hec Cojuar 700w
VGA : ATI Radeon GigaByte HD 5850 1G.B GDDR5
Case : Antec 1200
H.D.D : Western Digital 500 G.B 32 Cache !
Rams : Mushkin DDR3 2 G.B x 3 bus 1600 !
Monitor : Samsung 20 Wide Screen !
heres my first problem that i think its related to what i got here !
first of all : the mobo doesnt see the rams ! it clearly shows that there are 6 g.b rams however it doesnt give indication that there are rams ,. i went to the catagory of the mobo and i found out that the mushkin rams are not on the list ! ive contacted the spplier and he said its okay and there are no problems as long as the mobo is working with them and the windows do see the rams !
the real problem is : started when i switched to Windows 7 ! first we used a Windows XP 32 Bit just to check the pc and i kept using that windows for about a week ! finished Assassin's Creed and Dead Space ! and then i changed to the curtain windows , Windows 7 64 Bit ! i had no problems except installing the required files for the mobo etc etc so i had to go to asus website to download the drivers ! but u know im a good lazy guy lol ! anyway the pc was working fine within 2 days the first thing happened ! World In Conflict Crashed ! no idea what i did nothing happened no lags nothing but the game crashed ! i was hearing that the sound is working greatly but i cant see anything on the monitor it freezed i checked the keyboard if its a full major failure in the pc ! turned out that the keyboard still got power and its working but nothing on the screen but the sound is working normally as if im playing ! i ran a full system scan using Kaspersky full edition and SpyBot Search & Destroy and nothing was there ! the pc is clean ! but so far Assassin's Creed and working in conflict crashed at the same way donne if Dead Space did the same ! Notice : im running all games MAX GRAFIX and no lag at all ! this crash never happens when im on the pc working normally ! i did a benchmark for World In Conflict and it clearly gave me the benchmark with no issues at all !
can someone tell me please whats wrong ?

anyone hello ??????????? recently the same problem happened but with YouTube ! the screen freeze no options are responding ! but i avoided this one and returned back to the windows with the Task Manager ! can someone please tell me whats wrong ?

not at all ! no lags nothing just some sound problems with Assassin's Creed and it was solved in Windows 7 ! but the pc freeze ! i also got to tell that i havent installed the ASUS drivers ive installed them this time and checking , im downloading Directx right now ! and rechecking asap ! also about my rams timing its 8-8-8-24 ! i think its not bad !

marco324 wrote :


maybe check ram timings voltage check the for bad ram windows vista had 1 built in
check drivers. you had no problems with xp 32 bit ?


did you check the voltage?