Since installing Arma 2 OA neither OA or Arma2 will start

[66Chevy 10]

I have been running Arma 2 (non steam version) with no major problems since it was released

I just bought Operation Arrowhead on steam and when I try to start it the computer freezes and I have to reboot

Since installing Arrowhead, the original Arma 2 is doing the same thing, so I can't play either game

I've looked at a few threads about similar probs, but I can't find this exact problem,

I've tried running steam as administrator, and I've tried running with -exThread=1 on the command line as suggested on another thread

I've patched Arma2 to 1.08

I've also tried uninstalling Arma2 so there is just Arrowhead installed

My ArmA2OA.rpt file has the following for each freeze:

=====================================================================

== c:\program files (x86)\steam\steamapps\common\arma 2 operation arrowhead\ArmA2OA.exe

== "c:\program files (x86)\steam\steamapps\common\arma 2 operation arrowhead\ArmA2OA.exe" -exThreads=1

=====================================================================

Exe timestamp: 2010/12/05 15:13:50

Current time: 2010/12/08 18:43:36

Version 1.56.76134

Item str_disp_server_control listed twice

system info:-

Processor Information:

Vendor: GenuineIntel

Speed: 2666 Mhz

4 logical processors

4 physical processors

HyperThreading: Unsupported

FCMOV: Supported

SSE2: Supported

SSE3: Supported

SSSE3: Supported

SSE4a: Unsupported

SSE41: Supported

SSE42: Unsupported

Network Information:

Network Speed:

Operating System Version:

Windows Vista (64 bit)

NTFS: Supported

Crypto Provider Codes: Supported 323 0x0 0x0 0x0

Video Card:

Driver: ATI Radeon HD 3870 X2

DirectX Driver Name: aticfx32.dll

Driver Version: 8.14.01.6150

DirectX Driver Version: 8.17.10.1047

Driver Date: 23 Oct 2010

Desktop Color Depth: 32 bits per pixel

Monitor Refresh Rate: 59 Hz

DirectX Card: ATI Radeon HD 3870 X2

VendorID: 0x1002

DeviceID: 0x950f

Number of Monitors: 1

Number of Logical Video Cards: 1

No SLI or Crossfire Detected

Primary Display Resolution: 1920 x 1200

Desktop Resolution: 1920 x 1200

Primary Display Size: 26.65" x 16.65" (31.42" diag)

67.7cm x 42.3cm (79.8cm diag)

Primary Bus Type Not Detected

Primary VRAM: 512 MB

Supported MSAA Modes: 2x 4x 8x

Sound card:

Audio device: Speakers (Realtek High Definiti

Memory:

RAM: 4093 Mb

Miscellaneous:

UI Language: English

Microphone: Not set

Media Type: DVD

Total Hard Disk Space Available: 476937 Mb

Largest Free Hard Disk Block: 116190 Mb

Steam Hard Disk Usage: 103857 Mb

OS Install Date: Jan 01 1970

Game Controller: None detected

The freeze happens just after the progress bar with tick boxes on it disappears, but it doesn't go into arma it just freezes on the desktop

My graphics card drivers are up to date and I have no problems with other games, Fallout New vegas, call of duty modern warfare etc work fine

---------- Post added at 08:10 PM ---------- Previous post was at 07:21 PM ----------

OK Fixed it by going back to an older video card driver, come to think of it I updated it the same day I installed Arrowhead

I will try the new drivers again tomorrow, maybe was just a bad install

Thanks for reading :)