What model of camcorder is this video from?
Remember that MOVs and AVIs are only containers. They can hold files that are made up of any of thousands of codecs.
Open each in G Spot or MediaInfo and post the resolution, frame rate and especially the audio and video codecs it lists.
Welcome to the forum.
To give you more info on Steve G's comments, and questions, this FAQ Entry goes into a lot more detail: http://forums.adobe.com/thread/440037?tstart=0
Knowing what is inside of the AVI & MOV wrapper is very important to helping you get those files Imported into PrE.
Good luck, and please let us know more.