I get an error saying Filter not Founded / NVIDIA_Video_Decoder, i click ok and it works well, any way to fix/bypass the error?

you need a proper filtergraph in \progdvb\filtergraphs and you have to choose it in progdvb : settings->audio/video->direktshow ... and proper renderer settings...(VMR and progdvb renderer works mostly)...

If this not works then the used filterpraph is not ok ->

you have to build a proper filtergraph if you want to use a codec in progdvb....for this use graphedit (included in progdvb package)...

http://msdn2.microsoft.com/en-us/library/ms787460.aspx

got a new xgr file from a forum from a post mentioning the exact same problem, works smoothly now:)