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Hi John.
What program did you capture the avi with?
What version of Registax are you using?
I've never had that problem, but as Paul said, upgrade to the latest if you haven't got it already.
You can try splitting the avi into smaller components using virtualdub or something similar. You can also try saving the avi as a lot of BMP files (using virtualdub) and then drag those bmp's into registax.
Also, 3000+ frames is a lot! What object were you imaging? What frame rate were you using? What camera were you using?
Create reference frame - I do this as soon as I get into the optimise tab. Leave it at default 50 frames, it will align+stack 50 frames and go to the wavelets tab, I do mild wavelet processing, layer 3, +5.1 or so. Then click continue. You are then taken back to the optimise tab.
What it's doing, is now using that slightly processed frame to try and optimise the rest of the frames against. It's your "this is what I want all the others to look like" frame. It will optimise all other frames to try and look like that one, and will help weed out the bad frames, so when you go to the stackgraph slider (on the stacking tab), you can choose only the best (drag down the vertical slider) and leave the bad frames (that don't match your optimised one) out of the stack.
Hope that helps!
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