Render Preview Error - Help?

Question

Hi, I keep getting this error:
Error reads:
"After Effects error: unable to allocate space for a 2848 x 2136 image buffer.
You may be experiencing fragmentation. In the Memory and Multiprocessing Preferences dialogue box, try increasing RAM to leave for other applications, and selecting the Enable Disk Cache option in the Media & Disk Cache panel"
This is in AECS4 and I've tried to do what it says but I'm not sure what to change it to, and although I've already tried changing things as suggested by the error message - it still comes up after doing a ram preview render of about 6 seconds.
I'm trying for 11 seconds but what I get is 6 seconds and this error message - after which I have to close AE down and start it up again.
I have intel R core 2 quad CPU
Q6600 @ 2.40GHz
2.40GHz, 3.00GB of RAM
Running WinXP Media Centre Edition version 2002, Service pack 3
on a PC called "Monster"
I've also checked the size of the images and reduced the size of the biggest, but I'm still getting the error message, getting it both on RAM Preview and on Make Movie in the render queue.

Answer 1

Um, just in case it helps here's the bit at the beginning of the log:
Adobe After Effects v9.0 (Windows) render log for project NoirGoodFogGoodMan9CS4.aep
Rendering started on 08/01/2009 at 13:21:31
08/01/2009 13:21:31: Starting composition Paving.
Render Settings: Best Settings
Quality: Best
Resolution: Full
Size: 720 x 576
Proxy Use: Use No Proxies
Effects: Current Settings
Disk Cache: Read Only
Color Depth: Current Settings
Frame Blending: On for Checked Layers
Field Render: Off
Pulldown: Off
Motion Blur: On for Checked Layers
Use OpenGL: Off
Solos: Current Settings
Time Span: Custom
Start: 0:00:22:10
End: 0:00:40:01
Duration: 0:00:17:17
Frame Rate: 25.00 (comp)
Guide Layers: All Off
Storage Overflow: On
Skip Existing Files: Off
Output Module: Lossless
Output To: C:\Documents and Settings\Fran\My Documents\Adobe\AfterEffects\FilmNoir\FogCameraMan1.avi
Format: Video for Windows Movie
Output Info: No Compression
Include: Project Link & Source XMP Metadata
Output Audio: Off
Channels: RGB
Depth: Millions of Colors
Color: Premultiplied
Stretch: 720 x 576 (High Qual)
Crop: -
Final Size: 720 x 576
Profile: -
Embed Profile:
Post-Render Action: None
0:00:22:10 (1): 15 Seconds
0:00:22:11 (2): 11 Seconds
0:00:22:12 (3): 11 Seconds
0:00:22:13 (4): 14 Seconds
0:00:22:14 (5): 14 Seconds
0:00:22:15 (6): 12 Seconds
0:00:22:16 (7): 13 Seconds
0:00:22:17 (8): 13 Seconds
.... now what?