What? Using decent grammar might help.
What do you mean your rendering it wrong?
What you should do from start to finish:
Import your videos into a video transcoder. Transcode from H.264/MPEG-4/AVC to an uncompressed codec. Im not sure which one it is for CS5 or Vegas 10, but for FCP its gonna be Pro Res 422 LT.
From there, import your videos to the editor. Do what you want with them until you want to export.
When you export from the editor, your going to want to follow these guidelines if your using Vimeo or Youtube. Look at a simple tutorial on youtube to render/export.