Good evening.. I render my project in after effects cs5.5 and the background image(jpeg type) i had put in it isn't show in the export video..I have windows 7 (if is this helps).. Is there something wrong with the layers or the image type? Thank you.
We can't tell what's wrong from your description. A nice screen shot of your project will be very helpful.
You have your background set as a guide layer (that cyan icon). Guide layers don't render.