Re-installing won't fix the problem.
Try re-encoding the file with a program like VirtualDub, available free from www.virtualdub.org
There are tutorials on how to use VDub on the net, search for them to find out how to save a .avi file in a different codec.
But, just to let you know, you won't have this problem once AlamDV3 is released, which should be in the near future.
Hope this helps