[Chizas]

Please can someone help me as I'm starting to lose the will to live!

About six months ago I installed a new Graphics Card (Geforce 6600 256 AGP) and all was well until a month ago. Now it will only run a high-end game (Battlefield 2, Call Of Duty 2) for about an hour or so before holes start appearing in the terrain and characters. Then 'spikes' start appearing and it eventually becomes unplayable.

Updated the Graphics Drivers - No effect
Installed an additional case fan - No effect
Upgrading the CPU fan (grasping at straws by this stage) - No effect
Exchanged the Graphics card for a new one - No effect

Can anyone suggest what might be going wrong before I throw the whole thing out of the window!

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Forgot my specs;

Windows: Windows XP5.1 (Build 2600) Service Pack 2
Internet Explorer: 6.0.2900.2180
Memory (RAM): 1024 MB
CPU Info: Intel® Pentium® 4 CPU 2.66GHz
CPU Speed: 2669.0 MHz
Sound card: C-Media Wave Device (2)
Display Adapters: NVIDIA GeForce 6600 | NetMeeting driver | RDPDD Chained DD |
Screen Resolution: 1280 X 1024
Network: Network Present
Network Adapters: BT Voyager 205 ADSL Router - Packet Scheduler Miniport | SiS 900-Based PCI Fast Ethernet Adapter - Packet Scheduler Miniport |
CD / DVD Drives: E: _NEC DVD+RW ND-1000A | F: LG DVD-ROM DRD8120B |
Default Printer: Canon PIXMA iP1500
COM Ports: COM1 | COM2 |
LPT Ports: LPT1 |
Mouse: 5 Button Wheel Mouse Present
Hard Disks: C: 114.5GB | D: 111.8GB |
Hard Disks - Free: C: 75.9GB | D: 21.8GB |
USB Controllers: Detected: 7 host controllers.
Firewire (1394): Detected: 1 host controllers.
PCMCIA (Laptops): Not Installed
Manufacturer: Phoenix Technologies, LTD
Product Make:
Serial Number:
AC Power Status: OnLine
BIOS Info: AT/AT COMPATIBLE | 01/16/03 | AWARD - 42302e31 | |
Time Zone: GMT Standard Time
Battery: No Battery
Motherboard:
Modems:

[Chizas]

Forgot my specs;

Windows: Windows XP5.1 (Build 2600) Service Pack 2
Internet Explorer: 6.0.2900.2180
Memory (RAM): 1024 MB
CPU Info: Intel® Pentium® 4 CPU 2.66GHz
CPU Speed: 2669.0 MHz
Sound card: C-Media Wave Device (2)
Display Adapters: NVIDIA GeForce 6600 | NetMeeting driver | RDPDD Chained DD |
Screen Resolution: 1280 X 1024
Network: Network Present
Network Adapters: BT Voyager 205 ADSL Router - Packet Scheduler Miniport | SiS 900-Based PCI Fast Ethernet Adapter - Packet Scheduler Miniport |
CD / DVD Drives: E: _NEC DVD+RW ND-1000A | F: LG DVD-ROM DRD8120B |
Default Printer: Canon PIXMA iP1500
COM Ports: COM1 | COM2 |
LPT Ports: LPT1 |
Mouse: 5 Button Wheel Mouse Present
Hard Disks: C: 114.5GB | D: 111.8GB |
Hard Disks - Free: C: 75.9GB | D: 21.8GB |
USB Controllers: Detected: 7 host controllers.
Firewire (1394): Detected: 1 host controllers.
PCMCIA (Laptops): Not Installed
Manufacturer: Phoenix Technologies, LTD
Product Make:
Serial Number:
AC Power Status: OnLine
BIOS Info: AT/AT COMPATIBLE | 01/16/03 | AWARD - 42302e31 | |
Time Zone: GMT Standard Time
Battery: No Battery
Motherboard:
Modems: