Constant replacing textures

For the past...who knows, months, I've had constant graphical glitches where full map, character, and UI textures are replaced with odd pictures that are either icons, chopped up pictures, or a little bit of both. A simple /reloadgfx would solve the problem temporarily until I moved on into another zone. And for a while now, I didn't even care until a friend of mine re-joined CoH and he stumbled upon the same problem and started to complain. Both of us use ATI cards, his being the 5600 and mine the 5800 series. I believe there is something wrong with our settings but I don't know if anyone else has stumbled upon these problems before and solved them which is my esteemed hope before I start altering things I'll forget about later. A screen shot and HijackThis report are posted below. Any help would be much appreciated.

http://i.imgur.com/wJ0ZA.jpg

---System information gathered by CoH Helper version 0.2.0.2---

DxDiag gathered at May 8, 2011 14:34 (-07:00)
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.101026-1503)
System Manufacturer: OEM
System Model: OEM
BIOS: Phoenix - AwardBIOS v6.00PG
Central Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz (8 CPUs), ~2.7GHz
Memory: 12288MB
.Net Memory Report: 9450MB out of 12279MB available
Page File: 21440MB (3115MB currently in use)
C Drive: (WDC WD6400AAKS-22A7B0 ATA Device) 299501MB out of 610477MB (49%) free
D Drive: (HP DVD Writer 1270d ATA Device) zero-size drive
Windows directory location: C:\Windows
DirectX: DirectX 11
DirectX Diag version: 6.01.7600.16385 (64-bit version)

Display Notes: No problems found.

No problems found.
Sound Notes: No problems found.

No problems found.

No problems found.

No problems found.

No problems found.
Input Notes: No problems found.

Monitor:
Monitor's Max Resolution: (blank)
Video Device Name: ATI Radeon HD 5800 Series
Manufacturer / Chip: ATI Technologies Inc. / ATI display adapter (0x6899)
Video Memory: 2794 MB
Driver Version: 8.831.2.0
Driver Date: 3/8/2011 9:55:52 PM
Driver Language: English

Monitor:
Monitor's Max Resolution: (blank)
Video Device Name: ATI Radeon HD 5800 Series
Manufacturer / Chip: ATI Technologies Inc. / ATI display adapter (0x6899)
Video Memory: 2794 MB
Driver Version: 8.831.2.0
Driver Date: 3/8/2011 9:55:52 PM
Driver Language: English

Sound Device Description: Speakers (Creative SB X-Fi)
Driver File: ctaud2k.sys
Driver Version: 6.00.0001.1375
Driver Date: 5/5/2010 9:30:10 PM

Sound Device Description: Headset Earphone (2- Logitech USB Headset)
Driver File: USBAUDIO.sys
Driver Version: 6.01.7600.16385
Driver Date: 7/13/2009 5:06:32 PM

Sound Device Description: Digital Audio (S/PDIF) (High Definition Audio Device)
Driver File: HdAudio.sys
Driver Version: 6.01.7600.16385
Driver Date: 7/13/2009 5:07:00 PM

Sound Device Description: SPDIF Out (Creative SB X-Fi)
Driver File: ctaud2k.sys
Driver Version: 6.00.0001.1375
Driver Date: 5/5/2010 9:30:10 PM

Sound Device Description: Digital Audio (HDMI) (High Definition Audio Device)
Driver File: HdAudio.sys
Driver Version: 6.01.7600.16385
Driver Date: 7/13/2009 5:07:00 PM


WMI Information
Motherboard Manufacturer: EVGA
Motherboard Model: (empty)
Motherboard Product: 132-BL-E758
Motherboard Version: Tylersburg
BIOS Manufacturer: Phoenix Technologies, LTD
BIOS Name: Phoenix - AwardBIOS v6.00PG
BIOS Version: IntelR - 42302e31
BIOS Release: 20100630000000.000000+000


Registry Information for Current User
Resolution: 1920x1138
3D Resolution: 1920x1138 (Not using renderscale)
Full Screen: No
Maximized: Yes
Screen Position: 0, 0
Refresh Rate: 60Hz
Vertical Sync Enabled: No


Physics Quality: Medium
Maximum Particles: 50000
Max Particle Fill? 10.000
Physics Card Enabled: No


Anti-aliasing: Off
Anisotropic Filtering: 4x
Texture LOD Bias: Smooth
Water Effects: None
Bloom: 1.000 (turned on)
Depth of Field Enabled: Yes
Desaturation Effects (Sepia) Enabled: Yes
Shader Detail: High


World Texture Level: Very High
Character Texture Level: High
World Detail Level (Vis_Scale): 1.000
Entity Detail Level: 1.000
Shadows Enabled: No
Shadow Mode: Unknown (5)
Shadow Map Shader: High quality
Environmental Reflections: Ultra quality
Advanced Occlusion Settings: No
Ambient Occlusion: Balanced
Occlusion Strength: Medium
Blur: Bilateral
Ambient Resolution: Performance


Gamma Correction: 1.000
Geometry Buffers (VBOs) Enabled: Yes
Suppression of FX When Camera Close Enabled: No
Close Suppression Range: 3.000
Show Advertisements: Yes

Audio Mode: Performance
3D Audio: No
FX Sound Volume: 1.000
Music Sound Volume: 0.600

Show Advanced Graphics Options: Yes
Overall Graphics Quality: 0.500
Reverse Mouse Buttons: No
Save Login Username: No
Transfer Rate: 419593 bytes/second
Current Game Version: 2010.201105021815.1
Installation Directory: C:\Program Files (x86)\City of Heroes

Mod files in the Data directory
No modifications found

---

Sounds like the graphics card may be overheating. - Check the cooling fan is clear of dust and is rotating. - You may need to add another case fan if your system temeratures are high - especially if the card doesn't expel hot air out of the case.

Could also be that it isn't getting sufficient power.
What is your PSU rated at and are you using a seperate rail from your system connectors - cheap generic PSUs often cannot provide sufficient power on the right rails even if they are rated higher than better quality ones.

---

Mind of Gaia lvl 50 Defiant's first Mind/Storm 'troller.
Deadly Doc 50 Dark/Dark Corr
and lots more on Pinnacle,Union and Defiant