OK, lets run through some things here step by step.
Firstly, what have you downloaded (name of torrent) that won't play?
What programs have you tried to get them to play and, most important, what format are they (mp3, flac, avi etc).
It may be that you lack the correct codecs to play the files - that's why I ask you to tell us which files you are having problems with.
Also, have the files actually finished downloading OK (partially downloaded files won't play).
You could also try moving the files to another folder and redownload them just in case something went wrong.
Lastly, in Bittorrent, if you highlight the item, there should be a tab at the bottom of the page which says things like tracker, peers etc and one should be files. Does that show as a full bar (ie completed)?
Sorry for all the questions but we need them ALL answered if we are to help you.
The basic line is that the files are OK so there's something in your setup that's not right so a bit of a detective job to find out what.
Don't worry, we'll find it - we've probably all been through this in our early days.
