HELP! Random Video Lag

[TheDiscoverer]

Hi!
So as the title says I get random video lags when playing a movie on BS Player fullscreen. It does not matter when I get it whether its quick, changing scenes when people are fighting or when people are talking. It just lags, stops for 2-5 seconds then the sound usually continues, the picture stays the same for about 10-15 sec and subtitles change. It's really annoying and I can't find the solution to this anywhere so I really appreciate it if someone will help me /=
EDIT: if it helps; when I click on the movie to play it my Windows gives me notification that it had to change a color scheme I believe for a certain program (BSplayer) and it will change to aero when it closes or something like this.

Peace!