High Definition Movies

Why everytime i play Blue ray copy movie or HD movie in my laptop the movie itself sometimes will become slow. May laptop is toshiba Satellite L35D-S5882 3gig memory 200g Hard disk space ATI Radeon 3100 Graphics. Please help.

Maybe you have a virus that records the movie and sends it to a pirate server while you watch it, and being a poorly written virus slows down the computer in the process.

Conspiracy theory, probably. You're not really giving us much to go on though.

I watched the movie in my Desktop computer and it just works fine. Even sometimes when im playing games in my laptop it just turn slow for about less than a minute then works fine again. Just like when im watching high resolution movies. A bit lag for lessthan a minute then works fine again then after few minutes lag again.