I've tried DivXFix and a few others but none of them would fix the index errors I had in my files.
One way to fix errors in files is to get Shareaza and find the file you have (same size is the best way of doing it as the filenames are not always the same for the same file). Make a backup before you start. Then start downloading the file you have found then close Shareaza and then copy your file over the file that was being downloaded leaving the .sd file. rename your file to the one that was downloading. Then start Shareaza again and connect and right click the file and select Advanced --> Advanced Edit. Then on the window that shows click "Assume file is 100% complete and reverify" Then Shareaza will check your file for bad parts and remove them and begin downloading the parts that were corrupt. I have successfully done this with one movie I had that had index errors and it fixed it completely. No program that claims to fix avi index errors actually did so. But this method did. You can use this method with any corrupt file as long as it is available on P2P and you can identify the correct file. Hope this helps.

Edit:
A standard DVD player won't play avi files anyway so unless you purchase one with DIVX/XDIV capabilities like has already been mentioned then your only option is to convert the avi file to DVD format. The file will play on your computer but not on the DVD player as your computer just uses codecs to play the file, as long as you have the correct codecs installed the file should play.

RedDwarf