WIN 2000 ADMIN PASSWORD LOST

Hi,

I have a advanced 2000 server and client Win2000
I changed the TCP/IP and workgroup of Win2000 client to get through the Server but when I re-start the Client I can no longer key-in the password nor the original password? I also dont havefloppy drive on the client, could you help on this. The client got all my files.

regards,

vik