SOLUTION FOUND: The problem is the media player, Mobo and many other don't work properly. TO PLAY PERFECTLY AVI, WMV, FLV and all kind of video files in your Hannspad please, use the last version of RockPlayer.
Or download it from the net...
Just find ROCKPLAYER (last version) APK in Google
It works fine, and you'll be able to play all kind of files, even video files with AC3 audio.
Use always the SOFTWARE DECODING MODE.
Hannspad is able to reproduce "decently" HD files, but not perfectly. HD files are HD Ready or Full HD files.
However, normal video files are played nicely.
If you have a very heavy video file 1920 x 1080 Full HD it would be a good idea to convert it to a lower frame size.