please help me

[samtucker4u]

hi every one i have problem with my laptop
when i want to watch movie in full screen normaly it get stuck or its very slow but if i watch it in small screen then it is great
it was not like this where i am doing wrong
what hapen to my display
even if i want to watch any thing in full screen on youtube
i have same problem
please help me thanks

[EINSTEIN_007]

what are the extensions of the movie files? Do you have any codecs installed?