From your question I suspect file-association is/was the reason of your problem.
Probably caused by an uncommon way of uninstalling?
This should be done in the same way as any other program.
See FAQ:
http://www.bsplayer.com/en/bs.player...q=52#question5
However, it appears that you meanwhile found a solution:
http://bsplayer.com/forum/viewtopic.php?t=13476