Which media did you use? I had the same problems with Platinum CD-R's sometimes (Platinum uses different manufacturer's for their CD-R's): after writing the discs (also AVI files) the contents would be difficult to copy to my harddisk again. The disc would go fast, stop again, continue, etc.
I've since then switched to Arita Premium Line CD-R's and all problems were gone! Now the contents will be copied to my harddisk without any problems. within 4 minutes (700MB AVI file).