What does Diskette drive 0 seek failure mean?

I have a Dell DE051 with Intel Celeron Processor 2.53 GHz. I was on Facebook last night, my computer froze and I could not get it to shut down. I manually shut it down, then tried to boot it, but got the message "Diskette drive 0 seek failure". I did as much investigating online as I could, but it seems that this message refers to a floppy drive, which my computer does not have. I tried to reinstall Windows XP using my CD but it only got so far in installing and then said it could not find my hard disk drive. (I am not very computer knowledgeable)