If you are saying you downloaded some video clips
that are in a different format...the solution would be
to convert them to the WMV format.
There are many programs that can do conversions...
The following freeware is one example...:
(FWIW...it's always a good idea to create a System
Restore point before installing software or updates)
Format Factory
http://www.videohelp.com/tools/Format_Factory
(the 'direct link' is fastest)
(the file you want to download is : >FFSetup260.zip<)
(FWIW...when installing...you may want to uncheck
'all' the boxes on the final screen)
First you will need to unzip the file or just open the
folder and drag FFSetup260.exe out of the folder
and drop it on your desktop. Left click it to install.
Next...after downloading and installing Format
Factory...you may want to open the program and
left click the 'Option' button on the toolbar and
select an 'Output Folder' / Apply / OK.
(this is where you will find your files after they
are converted)
Drag/drop your video clips onto the main screen...
Select 'All to WMV' / OK...
Click...Start...on the toolbar...
That should do it...
Good luck...