Hope some can help me!

I am using Virtualdub 1.4.10 with win XP. When I try to convert a avi file to wav in vdub it restructes the missing block index and then an avi import filter box appers that states that "not speficied rekeying in open options" During this time I do got get the video inthe two boxes as shown in the demo on this site. I have gotten this to work once before without any problems but now I get these messages on all of my avi movies.

Assistance would be apperiated!! Thanks in advance.