Blocky pictures

Can anyone please tell me why i have downloaded moviefiles (legal of course) and put them onto dvd , sometimes there ruined by blocks of colours (green etc) and momenterely freeze some times .Is this just what i have d/l/ or is itperhaps poor quality discs.
i done one film , where the first hour was fine, then this problem occured.

Thanks

the problem is the format when it was rip down and the program you are using dont like the format you will find it will work ok on some and not on other

try using a avi repair to fix the problem
you can down load avi repair below its freeware

http://www.pctip.ch/downloads/dl/25257.asp