What do i do? Somebody help me to fix my pc.?

I'm unable to access any of my files .My system says ';file,device,path cannot be accessed';.How do i fix it.And i can't even change my OS. Whenever i insert my XP OS cd it takes me to dos.Help......! Help..........!Help..........!What do i do? Somebody help me to fix my pc.?
Turn off the PC. Wait a few minutes then turn back on.

If that doesn't help; to install your OS you will have to turn off PC, open CD ROM tray with a paperclip or other object and insert XP disk, close tray and then power on PC and ';boot from CD'; and follow your prompts.

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