cheers the java install sorted it. Stupid me, sorry but Im not a Windows user.
By the way the new version 1.31 improved the video quality alot (apart from a fair amount of picture tearing) and plays my vids without any troubles in media player.
However the new mPlayer Maemo 10 version is buggy as hell and the quality doesnt look as good as within media player. I had to pull the battery a couple of times to reset the bugger! Just sayin.