Graham - even if the floppy disk isn't connected it'll still appear under my computer - it just won't work!
Try checking that the floppy drive has been enabled in the BIOS. I took my floppy drive out of my PC as I never used it, and to stop windows displaying it in 'my computer' I had to disable it in the BIOS. (Let me know if you do not know how to access the BIOS).
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