It sounds like you're using a screen recording. The first thing I'd do is make the composition a standard size and crop or fit the screen capture to the comp. Odd sizes may present problems when rendering for final output.
The second thing I'd do if you want to render more of your movie is to set the composition resolution to half or even 1/4. Make sure the work area covers the entire composition (or the part you want to preview).
6GB of ram isn't that much. Your frame is about the same pixel dimensions as HD so 6 to 10 seconds is probably all you'll get at full resolution. Because of the limitations of screen size I'm usually working in AE with my composition window set to 50% zoom and the quality to half. Today I'm working on a laptop so the comp zoom or Magnification ratio is set to 25% and the Resolution is set to Quarter. My Preview panel has the resolution set to Auto so that it matches the Composition. This will give you much longer ram previews. Normal workflow is to only do a full resolution preview to check out small parts of a project. Motion and timing tests are almost always done with a smaller than full sized composition window at a lower than full resolution preview.
You should go through the getting startted with After Effects pages referenced all over this site or check the help files on previewing and rendering.
Thank you very much, I chose a smaller window to render my video in but I used the same quality.
So is it possible to preview an entire movie when it's done?
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That depends on how long it is. The only way to look at something at full resolution that is longer than the available ram is to render the project.
Please go through the Getting Started With After Effects resources found HERE.
Thank you again, I was stressing over this for quite a while and could not find the information I needed.
I closed down my project and began a new one and following your instructions the same problem occured, I had a smaller window and set the resolution to half but it didn't render the entire video.
Also, please follow the link to the getting-started resources that Rick pointed you to. Doing so will prevent a lot of frustration.