Sounds like the go. What is the mb size of the avi David?
You could also run it through PCFE (see files section) if you are doing Jupiter or Saturn. It will crop your images to whatever size you want it to be, so that if Jupiter only covers 300x300 pixels you can set you it to crop at 350x350 which will make Reg run faster. It will also initially sort your images with best ones first so all you do is drag the best "whatever" percentage into Reg and let it do it's stuff.