Graphic squares flickering


I'm having an issue with my ATI 4850 where whenever I play a 3d enabled game, the image will flicker with these graphics squares. It's hard to describe so I uploaded a short clip so you can see the problem for yourself:

I'm using ATI's official drivers (v10.2) and I haven't fiddled with any of the default settings (no OC'ing or fan speed adjustments or anything like that).

Here are my specs:
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_rtm.090713-1255)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 03/26/08 09:23:04 Ver: 08.00.12
Processor: Intel(R) Core(TM)2 Duo CPU E4600 @ 2.40GHz (2 CPUs), ~2.4GHz
Memory: 4096MB RAM
Available OS Memory: 4096MB RAM
Page File: 2133MB used, 6054MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 32bit Unicode

Display Devices
Card name: ATI Radeon HD 4800 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x9442)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_9442&SUBSYS_025E1043&REV_00
Display Memory: 2296 MB
Dedicated Memory: 505 MB
Shared Memory: 1791 MB
Current Mode: 1680 x 1050 (32 bit) (60Hz)

Any help is appreciated.
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