Created a DVD mpeg2 file from 6 separate .wmv clips using ArcSofts Showbiz. I've done fine with this app many times before.
The resultant file does play in Windows Media Player , but when I try to open it using Showbiz , OR Windows Moviemaker , it appears as a sound file only ?? No picture !! I have never had this happen before.
I've tried to find a "Repair" tool in XP , which I have seen before , but cant find it anywhere. (I do remember that only a limited set of programs were found there anyway, and may not be a fix.)
I have no separate install file for Showbiz , as it came with XP. (aha, my recovery discs !....but still may not find help there.)
Any thing to do with codecs perhaps? I have not made any intentional setting changes to anything , as I wouldnt know what I was doing.

There's a tool called GSPOT that can give some info on your MPEG2 files.

http://www.videohelp.com/tools?tool=GSpot

This may help identify what's wrong with them.

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System - Athlon 1.4GHz, Win98, Hauppauge PVR250 receiver and compressor.
Software -Magix Movie Edit Pro 10, Nero 6 + NeroVision Express, Moho 4.61, PSP 8.1, Bryce, Quicktime 6.52 pro, Goldwave 5, DVD-Lab.
Cameras - Panasonic GS9, Canon ES8400V, Canon EOS D20 and Canon A70