AMD Radeon HD 6700 series issues?

[Bosko]

From the moment i bought my pc i had problems when playing mw2. (and yes its original). No viruses, no overheating, no dust, disabled everything that could be causing some problems and still geting these freezes. It doesnt turn black, it goes a random color with lines/stripes. It was usualy something like orange-brown like color, but now most usually its gray screen with those lines. So is it a problem in video card?

my pc specs:
OS Name Microsoft Windows 7 Ultimate
Version 6.1.7600 Build 7600
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Type X86-based PC
Processor Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz, 3301 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 0217, 15/04/2011
SMBIOS Version 2.6
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale Serbia
Hardware Abstraction Layer Version = "6.1.7600.16385"
Time Zone Central Europe Daylight Time
Installed Physical Memory (RAM) 6.00 GB
Total Physical Memory 2.99 GB
Available Physical Memory 1.81 GB
Total Virtual Memory 5.98 GB
Available Virtual Memory 4.67 GB
Page File Space 2.99 GB
Page File C:\pagefile.sys
and video card is:AMD Radeon HD 6700 Series