Dell 1525 laptop keeps freezing

My dell inspiron 1525 keeps freezing. I turn it on and it starts up just fine but when i start doing things on it like opening internet explorer or i tunes it will freeze and sometimes when I do open Itunes it will play the song and then just freeze right in the middle of the song for no apparent reason, I then do a hard shut down wait ten seconds and turn the computer on again. When I turn it on i choose the decision run windows normally and it will start setting up and then the screen will go all black and say it needs to check the disk, i will let check the disk and it comes up with no problems. I have tried system restore. I have tried antivirus programs. Nothing seems to be working, even the computer i am on which is a compaq windows XP is doin the same thing. Please help!