Composition switches to 'not real time'; incomplete render

Hi there,
I'm a film student at Ryerson University in Toronto, new to AE CS3, and having a problem.
I have a 30-second composition utilizing keyframes, and all of the groundwork is done, but in the preview (both regular and RAM) it is not moving in realtime (29.97 fps) and the composition stops 5 seconds early in the RAM preview. When it renders, the image is out of synch with the music.
Even my professor is stuck with it. I've tried disabling the layer cache and set a purge for every frame, but nothing's working.
Any help?
computer is a dell inspiron 1420 with 2GB RAM and plenty of hard drive space.

Thanks Jonas and Mylenium.
Followed every direction and insight, and none fix the problem.
The audio file was created using Audacity; as far as i can tell it was a perfect capture; imported from .mp3 and converted to .wav with no problems on playback, both in WMP and AE during the ram preview.
Once a .mov file, the synching comes and goes. The first 7 seconds are fine, then it slows down and goes out of synch and stays that way.
Render report is as follows:
Adobe After Effects v8.0x247 (Windows) render log for project VS assignment 1 (food).aep
Rendering started on 13/11/2008 at 5:07:22 PM
13/11/2008 5:07:22 PM: Starting composition Comp 1.
Render Settings: DV Settings
Quality: Best
Resolution: Full
Size: 720 x 480
Proxy Use: Use No Proxies
Effects: Current Settings
Disk Cache: Read Only
Color Depth: Current Settings
Frame Blending: On For Checked Layers
Field Render: Lower Field First
Pulldown: Off
Motion Blur: On For Checked Layers
Use OpenGL: Off
Solos: Current Settings
Time Span: Work Area
Start: 0;00;00;00
End: 0;00;29;29
Duration: 0;00;30;00
Frame Rate: 29.97 (comp)
Guide Layers: All Off
Storage Overflow: On
Skip Existing Files: Off
Output Module: Microsoft DV NTSC 48kHz
Output To: C:\Users\Paul\visual studies assignment 2 (food)\Comp 1.avi
Format: Video for Windows Movie
Output Info: Microsoft DV
Spatial Quality = 100
Key frame every 1 frames
Embedding: Project Link
Output Audio: 48.000 kHz / 16 bit / Stereo
Channels: RGB
Depth: Millions of Colors
Color: Premultiplied
Stretch: -
Crop: -
Final Size: 720 x 480
Profile: -
Embed Profile:
Post-Render Action: None
couple more questions:
- Why is exporting a bad idea? The result is the same in both the render queue and export as QT movie.
- how / where do I post the project? You guys sound like pros, that might be the best idea. I could email the files to you (less than 30mb) and if you open it in cs3, it might be easier for you guys to take a look.
Thanks again!
Paul.

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Composition switches to 'not real time'; incomplete render

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