You can grab VLC or a codec pack such as the k-lite codec pack. There isn't much info to go on in your post so its hard to say one way or another.
If you have powerdvd or someother commerical media player that playes your blu-ray discs. Then you can create an iso image of your file then mount it w/ a virtual drive.
first, u need a blu-ray drive, then use VLC or Gom player which can play any video files. If your PC is good enough, u will enjoy HD movies on your pc