You will need to try some basic actions and then give us more information to help you: PrE Hanging, or Crashing - Some Tips.
Flip videos were always difficult in PRE8 or earlier. PRE9 has a specific Preset for them. When working through the above make sure you follow the instructions about telling us the format of that footage from the GSpot tool and the preset you used.
For YouTube most get much better results from using one of the methods described here: How can I get the best quality video on YouTube?
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It also might be helpful if you told us a bit more about what you're doing so we can advise you.
Premiere Elements 8 is not designed to work with Flip video. This element was added in version 9.