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Other than get a proper video CGI app like After Effects? Probably the only thing you can do is hope you used a lot of vector graphics which will upscale fairly gracefully. If you used a lot of bitmaps you're pretty much up the creek, especially if you didn't even do it at least 1280x720. You'd have to go back and retool any tiny bitmaps or they will simply get blurry as heck.
During exporting you can choose any resolution you want. You can choose 1920x1080 if you wish. Just export your movie at 1920x1080 and take a look at it. If it's acceptable then you need not do anything else.
In the future, definitely start with the highest possible resolution you may need. It's standard in video to produce in at or above the resolution of your target (typically larger) and then reduce size. It has a nice smoothing effect and you'll never be in this situation again.
Yeah, I figured as much. MOVs also seem to export much better than AVI's. The project is complete now (it was mostly text/vector) and it looks OK. Thanks for the input.
Glad you got it to work!