Uhm looks simpel: Something is wrong with ffdshow. Look at the direction of the file in the error message.
So now what can we fix it... Mhmm...
One possibility is to deinstall ffdshow and install the newest version.
If you want to analyse the problem more use this little helper:
http://www.updatexp.com/sherlock-codec-detective.html
Uhm... It could be nice when you give us more info. I miss the simpel info wich programm this is etc.
Isn´t Vista a pain in the ass for editing? I think it´s very hardware eating so I dunno.