BlueScreen Locale ID 4105, BCCode 124 on every games.

Hello, I need help with my computer. I've been getting BlueScreen when ever I play games on my computer. It mostly happenes when I play in in fullscreen mode.

When I play the game, after few minutes, its freezes, and goes black, then just be normal again.

Somtimes, The game goes black and the computer shuts down, and restarts.

Some other times, the screen goes green or blue (depending on the color of the current game). It has alot of stripes. Sometimes it goes black, then shuts down, or just goes back normally.

Sometimes the screen goes black and the notification windows pops up from the task bar, and it has a yellow triangle icon, and the bubble says "The Graphics Driver Has Stopped working and Windows have recovered".

When the windows shuts down, and turns back on, there would be an window saying, "Windows has shut down Unexpectedly" and the text says

Problem signature
Problem Event Name BlueScreen
OS Version 6.1.7601.2.1.0.768.3
Locale ID 4105

Additional information about the problem
BCCode 124
BCP1 0000000000000000
BCP2 FFFFFA80068BB8F8
BCP3 0000000000000000
BCP4 0000000000000000
OS Version 6_1_7601
Service Pack 1_0
Product 768_1

Files that help describe the problem
CWindowsMinidump020713-24554-01.dmp
CUsersKevinAppDataLocalTempWER-43867-0.sysdata.xml

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It pisses me off and I REALLY need to fix it.

Computer Specs:

Operating System: Windows 7: Home Premium
GPU: AMD Radeon HD 6670
CPU: AMD Athlon II X3 450 3.50 GHz
RAM: 6GB
HDD: 700GB
Power Supply: 550w

PLEASE HELP!!!