acces denied in safe mode ?

Yesterday evening, I asked my PC to boot in safe mode: I did it through msconfig, so that it will always boot in safe mode.

When the log window appears, it ask for a username and a password. Note that there is no room for a domain name anymore.

When I enter my usual name and password, impossible to log in!: it is asked to me to check the spelling of the name, the password,.. and the domain name..

My big problem here is that, because I’m not able to boot in normal mode anymore, I’m just unable to log in my computer!!!

I tried to log in safe mode with networking, which resulted in identical problem. If anyone of you has a solution, it is most than welcome..
Many thanks, nicolas