I don't know how to FDISK but to do a LLF you need to find the make and model number of your HD. The go the manufacturers web site and down the correct disk utility. This will be a program you extract to a floppy so you can boot from it.
LLF will write all zeros to your HD including the MBR (master boot record). Then you will need boot floppies for Win9x or a bootable CD for win2k/XP. This is a rather drastic measure but your system seems really messed up and you can start all over in one day, or spend weeks trying to figure out what's wrong with it.
Before you attempt this...
1. Backup everything you can. Do you have a burner? Is it working?
2. Let us know when you get the disk utility for the HD.
3. Reply to this post and tell us what OS you are using and complete system specs.
I'll do my best to keep an eye on this thread.
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