You don't say what cameras, pc's, cables and capture file type.
For an exact copy of minidv camcorder files you need to capture as dv-avi,
using firewire. http://www.myvideoproblems.com/Tutorials/MovieMaker/HowToCaptureDV-AVI.htm
Even then, MM shows a low resolution preview and only every other frame, so
it won't look as good in movie maker.