I am having the same issue with Nvidia Geforce GTX 275 drivers restarting over and over again, mid-game, every couple of minutes. I am also having alot of missing textures, and flickering textures, but that might be seperate issue for a different tread.
I am running Win Vista, SP2, with latest non-beta Nvidia drivers.
DxDiag:
Spoiler Operating System: Windows Vista? Ultimate (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.110617-0336)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 11/16/10 18:05:45 Ver: 08.00.15
Processor: Intel® Core i7 CPU 940 @ 2.93GHz (8 CPUs), ~2.9GHz
Memory: 12278MB RAM
Page File: 5057MB used, 19686MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 64bit Unicode
------------
DxDiag Notes
------------
Display Tab 1: No problems found.
Display Tab 2: No problems found.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Sound Tab 3: No problems found.
Input Tab: No problems found.
--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)
---------------
Display Devices
---------------
Card name: NVIDIA GeForce GTX 275
Manufacturer: NVIDIA
Chip type: GeForce GTX 275
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_05E6&SUBSYS_11733842&REV_A1
Display Memory: 4069 MB
Dedicated Memory: 869 MB
Shared Memory: 3199 MB
Current Mode: 1920 x 1200 (32 bit) (60Hz)
Monitor: SyncMaster 2433(BW/GW),Magic CX2433(BW/GW)/2433(BW/GW)(Digital)
Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver Version: 8.17.0012.8562 (English)
DDI Version: 10
BGRA Supported: Yes
Driver Attributes: Final Retail
Driver Date/Size: 10/15/2011 03:53:00, 15693120 bytes
WHQL Logo'd: Yes
WHQL Date Stamp:
Device Identifier: {D7B71E3E-46A6-11CF-807A-7F311FC2C535}
Vendor ID: 0x10DE
Device ID: 0x05E6
SubSys ID: 0x11733842
Revision ID: 0x00A1
Revision ID: 0x00A1
Video Accel: ModeMPEG2_A ModeMPEG2_C ModeVC1_C ModeWMV9_C
-------------
Sound Devices
-------------
Description: Speakers (2- Realtek High Definition Audio)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0889&SUBSYS_104383C0&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.5973 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 11/3/2009 18:39:58, 2023840 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX 2.0 Listen/Src: No, No
I3DL2 Listen/Src: No, No
Sensaura ZoomFX: No
Description: Realtek Digital Output(Optical) (2- Realtek High Definition Audio)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0889&SUBSYS_104383C0&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.5973 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 11/3/2009 18:39:58, 2023840 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX 2.0 Listen/Src: No, No
I3DL2 Listen/Src: No, No
Sensaura ZoomFX: No
Description: Realtek Digital Output (2- Realtek High Definition Audio)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0889&SUBSYS_104383C0&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.5973 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 11/3/2009 18:39:58, 2023840 bytes
Other Files:
Driver Provider: Realtek Semiconductor Corp.
HW Accel Level: Basic
Cap Flags: 0xF1F
Min/Max Sample Rate: 100, 200000
Static/Strm HW Mix Bufs: 1, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX 2.0 Listen/Src: No, No
I3DL2 Listen/Src: No, No
Sensaura ZoomFX: No
---------------------
Sound Capture Devices
---------------------
Description: Microphone (2- Realtek High Definition Audio)
Default Sound Capture: Yes
Default Voice Capture: Yes
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.5973 (English)
Driver Attributes: Final Retail
Date and Size: 11/3/2009 18:39:58, 2023840 bytes
Cap Flags: 0x1
Format Flags: 0xFFFFF