I also found a way. Copy the .avi file into its own empty folder, then using adobe imageready (it comes with photoshop 6.0) Do the following:
File-import-import folder as frames-(then browse to where the folder is and click on the folder and click open)
then it gives you three choices: import whole video, import selected parts, or import every (so many) frames. Do the second one and import the frames you want. DON'T import the whole movie, because it took about two minutes to import a 20 second avi file.