fixing a avi file

[pashack]

hi guys this is my first ever post on this forum and any time ive had a problem ive found a solution on here so ive never had to post anything before,anyway here is my problem
i have some great qaulity films and when i go to convert theres a part in the films that i lose the picture(goes all weired) for about 10 seconds then the film goes all out of sync its fine when in original format (ie avi divx xvid)i would be ever so gratefull if any of you guys can help me with this problem and if possible a step by step tutorial on how to do it
thaks loads in advance
paul

[Gees]

and if possible a step by step tutorial on how to do it

Step-by-step tutorials are in the Guides. You need the Convert section.

Get Gpsot and/or Avicodec to start. They'll help identify each type of file you have.

Try this https://www.videohelp.com/forum/userguides/142555.php to check for problems.