I'm not sure if this is the right place to ask, but I picked up a Vizio 8 inch tablet for my daughter for Christmas.  So far she's been loving it, but I am not having any luck with transferring movie files to it.  First I tried uploading one of those 'digital copies' that come with dvds and blurays these days, and I got the message that it could not be played.  I then downloaded a program called 'Handbrake' and tried converting that file to an mp4, but it seems like it can't or won't finish the conversion.  I am in the process right now of trying to convert an avi of another movie I have to see if that will work.  I THINK my main question is why do those digital copies not play on the tablet?  In the file properties they are listed as wmv files which is a format that the Vizio tablet supports, so why doesn't it work?  What am I missing here?When converting with HandBrake are you using the standard FFMPEG medium-quality .mp4 preset or are you using the H.264 .mp4 preset? There have been REPORTS of the mid-quality preset failing to work on various versions of HandBrake.

http://vizio.custhelp.com/app/answers/detail/a_id/204/related/1/session/L2F2LzEvdGltZS8xMzI1NDE3MzI3L3NpZC9zMVVzNDJOaw%3D%3D 
WMA, WMV, AVI, MP3, MP4, JPG, JPEG, AAC, ASF, 3GP, H.263, H.264. 
It supports AVI natively too...

As for the WMV files not PLAYING... perhaps there may be a sort of DRM protection preventing you from copying the files to an external device? You said they come with the DVDs...
http://www.buzzle.com/articles/how-to-remove-drm-from-wmv-files.html 

Yeah try converting the movies you have again and post results.

Happy New Year!Don't know if this is relevant to your tablet however recently i was attempting this on an Mp 4 player (transferring video) and noted that not only is the file format LIMITATIONS a factor but also the resolution size was also limited to specific criteria. Is that a factor here? truenorth