nothing will save to hd

Ok if you heard before every problem in the **** book had happened to my ibook. Well now nothing will save to the hd. IT wont download I cant save anything in appleworks keynote andything. It wont ripp cd's. absolutley nothing that has to do with saving to the hd wont work. That is so terrible I am so **** frustrated. Every application is slowley not being able to open. One by one they wont open I am losing every application one by one it is driving me crazy when i lose explorer I am lost. I think I am just going to crash the god **** thing so i can replace it. What is the point of a computer that cant save to the hd it is useless, and cant open application. about the only **** thing that i can do is turn it on. If you read my other thread, you would know that is where my problems begin. But they are ending since i cant open any applications so what is the point. Can anyone help me?(sorry about the language, but I am so pissed.

Thank you so much for the help, but, oh god here comes the but. IT is the schools computer so I cant do that it is all administer blocked so it is just *****ed. I thank you for your help though, is there anything else besides repair permisions, that does not requir administer permision, thanks

Reboot the computer
as soon as it starts to boot up hold down Apple + S
Once single user mode is done loading type in

/sbin/fsck -f and hit enter
it looks like it should repair somethings. If it does repair run the test again to make sure it says OK

when its done type in reboot and it will start up the computer again (it might be restart I always get the confused)

Thank you guys, I hope this brings relief, Im going to give that a try.