Angela, I think Chris may have the wrong end of the stick with your problem. If you can already get onto your PC to take off your security & firewall and also to clear off most of your files, then it is not likely to be the bi-directional cable or the power supply cable. The bios checks that drives are connected and working properly in the sense of hardware. The bios has no control over the operating system. It is therefore also not likely that Windows is corrupt. If it was Windows corrupt then the error messages would appear on startup of Windows, not at the bios level.
If you are not getting any error messages when loading up Windows, the likely chances are that the hard drive is ok.
If you take the case off (making sure it is disconnected from the mains), you can disconnect the floppy drive. There are two cables to unplug. The first is the power cable which has a small connector clipping onto the back of the floppy drive. The second cable is the flat ribbon cable. It's best to remove this from the motherboard as it's easier to get to there. When pulling the ribbon cable off the motherboard, be very careful to pull it off gently and level. Lop-siding the cable can bend the pins on the motherboard.
If, after doing this, the problem disappears, as I expect it will, you can replace the floppy drive. If the problem persists, or if you are not technically minded to carry out the above, best to take it to a local shop.
Hope the above helps.
Nigel
January 2009