access denied-unknow pass

As far as I know, you're hooped.(sorry)
But here's a little trick. The screen saver is actually runs with system privelages.(pretty freaky huh) but hey, that's better than the huge doors they used to leave open.

Boot into DOS - if you have NTFS, then you'll need NTFSDOS from winternals. I am gonna assume that you are running FAT32 because of the FAT errors.

Go to WINNT\system32, and make a backup copy of logon.scr. Now copy cmd.exe
to logon.scr and reboot. DO NOT login, touch the mouse or anything , we need to wait for "logon screen saver" to initialize, only it will run cmd.exe instead, in the context of system.

Now run compmgmt.msc to open computer management gui, and add a user account to the admin group.

Now you should be able to log on with the new Admin ID.

<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>

Reinstall Win2k over the current one.

When windows asks for the boot directory u can type /Win2k or whatever instead of /WINNT

If you leave it as /WINNTthen you will loose all previously stored
configuration.

Later on u can manually transfer your registry so it saves reinstalling all
the software again.

At least this way you can recover all of your files.

Good luck, the first one, I'vedone, the second option, I've heard of and it apparently works too.

Offline NT Password & Registry Editor:
http://home.eunet.no/~pnordahl/ntpasswd/index.html

"This is a utility to (re)set the password of any user that has a valid (local) account on your NT system, by modifying the crypted password in the registrys SAM file.
You do not need to know the old password to set a new one.
It works offline, that is, you have to shutdown your computer and boot off a floppydisk or CD. The bootdisk includes stuff to access NTFS partitions and scripts to glue the whole thing together.
Works with syskey (no need to turn it off, but you can if you have lost the key)
Will detect and offer to unlock locked or disabled out user accounts."

hope this helps

"I am gonna assume that you are running FAT32 because of the FAT errors. "

i dont know yet what my customer is running: ntfs i think. i dont understand your am statement.

is a passwordtecovery-tool useable?

peter nordahls linux-bootdisk helped.

can you explain me this?: which lost key? i have seen 4 logons: administrator, guest and two others, which i made blank all.

"Works with syskey (no need to turn it off, but you can if you have lost the key)
Will detect and offer to unlock locked or disabled out user accounts."