You are asking for trouble capturing on a Mac and editing on a PC. And you are getting what you asked for. Trouble.
If you have a .dv suffix, or no suffix at all, you may have trouble. Change the name to .mov and see what happens. In any case, you will be rendering whenever you do anything, unless you learn to capture in the DV AVI format that a PC expects.
I suppose you could export the file from Quicktime to a DV AVI, but there is no guarantee that there will be no quality loss.
Steven
https://www.stevengotz.com