hellow i wanna ask for you my ram 4gb but its 2.44gb usable how to fix it?? please :)

Umm, we have absolutely no idea?

If you would provide more information we might be able to help. What OS are you running? 32-bit or 64-bit? What hardware do you have? Where do you see htat 2.44GB is available?

I would guess that you are running a 32-bit OS, which limits your memory to 3 GB, and that you are using on-board graphics, which is taking up part of your memory. But that's just a guess.