Missing Domain Drop Down Box (DISASTER!!!)

I went into Control Panel/System to view my domain, to see if I can set up a
network with another computer (both names have to match) (This is a work
laptop) I hit another button, I think said create a network. I saw the word
WORKGROUP, and a check mark next to it. Thinking that that was the name of
the network and it was already set up, I hit ok, It took a few seconds and
then said I had to reboot. When I did, It now doesn't let me back into
Windows. It doesn't show a domain in the drop down. In other words it doesn't
even have the name of the computer as one of the options, or my work domain.
I can't get to Safe Mode.
I need a way to get the data off the hard drive, before I send it back,
because all they will do is probably reimage it.

Help.

Thanks