you are in luck:
 
Get you self a cd-bootable linux disk. (I believe 2k still uses FAT32 which means any linux cd-bootable will have read and write drivers.)
 
Boot up in Linux, and navigate to Windows directory
 
Find the screen saver (.scr) file that you use for your logon. By default it's logon.scr (Let's just use it as the example)
 
Also find cmd.exe
 
rename logon.scr to logon.bak
 
copy cmd.exe to make a copy, and rename the copy to logon.scr
 
Start back up in windows. Wait till the screen saver comes on...
I mean the cmd will show up
 
Here you can type:
 
net user *username* *new password*
 
*username* replace it with the administrator's user name
*new password* type a password you want to use
 
After that's done. exit
login
 
Change your password in windows.

Get Offline NT Password & Registry Editor from
http://home.eunet.no/~pnordahl/ntpasswd/
 
Read the instructions.