Video splitter ...join...and converting avi (error)

Hello Helen,

Thank you for contacting us.

Could you please specify what program do you use to convert your joined file?

It will be helpful if you could upload mpeg files you have joined to any file host service (e.g. dropbox.com) and send us the link to it.

Thank you.

I'm useung yuor program to split a mpeg file and is ok 100%,then i use the tool part of the program to join all splitted files in one mpeg file and is ok but...after i use another program (not yours) to convert the mpeg file in avi (xvid) and the program  crash,instead if i just convert the mpeg file with "that progrma" then is ok,i think maybe during the solit mode or the join more something changes in mpeg file so taht the "external" program wull crash.My question is..
There is a program i can get from u that will be able to convert after i have joined the mpeg file to convert it in avi (xvid) file?
Thank's in advance supporting me
Helen