I had always been able to login my machine without any password until today. My computer and my colleage's computer use ADSL modem (ethernet cabled) to connect to internet. I tried to network the two computers using the wizard. In the process I changed the workgroup when presented with the choice. On restarting, I am now presented with the password window that i am not able by pass by cancelling: as I did before. I did not enter any password when going thru the wizard. How can I now get into my machine?