|It sounds like either a bad hard drive (as above) or bad RAM|
First, try unplugging your hard drive (system unplugged) and replugging the signal cable.
Second you only show 256 on RAM (not really enough now) which indicates you probably only have one stick of memory and that could have gone bad also (your BIOS does rely on RAM) - try replacing it OR download a copy of Memtest on a different computer and creating a bootable floppy or CD that can test your RAM. If any of the tests fail, replace. (one or two 1GIG sticks would be best if your system can handle them, or else two 500Meg sticks, just make sure of the correct type).
If your memory is good (upgrade later when all else is OK, If Memtest works, your BIOS is probably OK), your hard drive is probably bad. You can download a utility from the hard drive manufactures site to make a bootable to test it though.