Alphabet keys ' p, u,l,x attached to different computer

Hello,

hello guys ,
i have a problem with my key board,
i use acer aspire netbook..
four alphabet keys ' p, u,l,x attached to different computer functions like if i press p then (projectors, duplicate , computer only ) etc option are opened i am very worried , i think its due to fn key which my computer consistently hold, please if you know about these issue help me.......
i want to disable my fn key,
i did it with ,fn +f11 butt when i did the other four keys are also turn off same lke fn...
please help me guys