[iwannaplay357]

Hello everyone, first of all i want to say ive been always ckecking this forum for whatever i needed, i always found out answers, but for my newest problem, i just dont know what to do.
I was hoping someone can help me, im really desperate.
The problem i have is, my screen freezes, keyboard and mouse dont react and the only thing i can do is restart pc, ive noticed it happens randomly, not sure how to explain.
Sometimes it freezes on desktop, sometimes on youtube, sometimes when opening mozila, sometimes when i play game.
I tryed several times doing clean windows re-install (windows 7 64bit)
I even upgraded to windows 10 but it only made it much worste with freezes.

My setup is :
CPU Name
AMD Phenom™ II X4 B55 Processor
Threading
1 CPU - 4 Core - 4 Threads
Frequency
3199.83 MHz (16 * 199.99 MHz) - Uncore: 1999.9 MHz
Multiplier
Current: 16 / Min: 4 / Max: 16
Architecture
Deneb / RB-C3-Step (45 nm)
Cpuid / Ext.
F.4.3 / 10.4
IA Extensions
MMX(+), 3DNow!(+), SSE, SSE2, SSE3, SSE4A, x86-64, AMD-V
Caches
L1D : 64 KB / L2 : 512 KB / L3 : 6144 KB
Caches Assoc.
L1D : 2-way / L2 : 16-way / L3 : 48-way
TDP / Vcore
159.65 Watts / 1.328 Volts
Type
Retail (Stock Frequency : 3200 MHz)
Motherboard
Model
Gigabyte M720-US3
Socket
Socket AM3 (938)
North Bridge
NVIDIA nForce 720a rev A2
South Bridge
NVIDIA nForce 720a MCP rev A2
BIOS
Award Software International Inc. F6 (09/16/2009)
Memory (RAM)
Total Size
4096 MB
Type
Dual Channel (128 bit) DDR2-SDRAM
Frequency
333.3 MHz - Ratio 3:5
Timings
5-5-5-15-20-2 (tCAS-tRC-tRP-tRAS-tCS-tCR)
Slot #1 Module
Transcend Information 1024 MB (DDR2-662) - P/N: JM667QLJ-1G
Slot #2 Module
Kingmax Semiconductor 1024 MB (DDR2-800) - P/N: KLED48F-B8KO6
Slot #3 Module
Kingmax Semiconductor 1024 MB (DDR2-800) - P/N: KLED48F-B8KO6
Slot #4 Module
Samsung 1024 MB (DDR2-662) - P/N: M3 78T2953EZ3-CE6
Graphic Card (GPU)
GPU Type
NVIDIA GeForce GTS 250 (G92)
GPU Brand
GIGABYTE Technology
GPU VRAM
1024 MB
Storage (HDD/SSD)
Model #1
Western Digital WDC WD2500AAJS-00VTA0
Capacity #1
250 GB
Display
Screen #1
H19W (HII1922)
Screen #1 Spec
19.1 inches (48.5 cm) / 1440 x 900 pixels @ 55-76 Hz
Miscellaneous
Windows Version
Microsoft Windows 7 (6.1) Ultimate Edition 64-bit
Windows Subver.
Build 7600
CPU-Z Version
1.78.3 (64 bit)
My psu is Gigatech 550w with cooler that has red light (Ive added extra 1*6 conector for video card since the psu didnt have it)

What ive done so far is, i tested HDD with HDD sentinel couldnt run test, because i used free program, but it showed 100% performance and 100% health and it showed 100+ days left lifespam
I've tryed removing one stick of ram per time, and running windows
The thing i noticed is, i used Prime95:"Blend" test that tests every component in pc
The strange thing is, with all 4 sticks on that test i get insta freez, so i tryed with 1stick of ram per time
1gb ddr2 1066mhz did not freez insta, it froze after 2mins
1Gb ddr2 800mhz went same as first one
1Gb ddr2 1066mhz didnt freez at all i didnt wait 2-3mins for it to freez i stopped program and repeated same thing with 1GbDDR2 667mhz
After that i tryed with all 4 sticks running same test and froze after few seconds.
I dont have USB to run memtest

it gives me freezes on random base

Example: i played mmorpg aion the other night with 500 players on map and i put all details to max and didnt disable players to see ingame to stress my pc even more, showed steady 20 fps after the siege was done, i went to a place where there was no one and it gave me freez
Its really weird, but i think its by random
I really dont know what else to do and im hoping someone can help me to solve my issue


Ps. i forgot to mention my bios version is latest