Vista - decoding files to burn on DVD movie maker

This is my problem: while burning to a DVD, the message "One or more of the files that were added in DVD maker could not be decoded correctly. Verify that you have decoding software installed on your computer that can decode the different files, and then try again."

After doing some research, I downloaded the GSpot 2.6 file. Now that it is downloaded, I'm not sure what to do next. It was supposed to detect what I needed to decode certain files.

I need help fast as I am working on a Mother's Day project. Can anyone help me?

what type of file is it that wont decode?

I am unable to find the ".xxx" title after the file name. Windows is calling it a "video file". I have deduced that it is the video taken from our Panasonic still camera that it doesn't like, however, it does accept the video taken from my father's Fuji still camera???

Where can I look to find the actual file name or type?

Thanks for responding

Open any window
Press Alt-T then choose "Folder Options",
then press "view"
then uncheck "Hide extensions for known file types"

Then hit apply

then you can see the file type by looking at the name