By changing the computer from the domain to a workgroup, you
destroyed the trust between the domain and the machine. In doing so,
you've also rendered your domain login credentials as invalid. You'll
need to be physically connected to the domain network, you'll need to
have administrative privileges to the workstation, and you'll need to
have sufficient privileges on the domain. Then you can add the machine
back on to the domain, after having first deleted the computer's old
domain account (unless you've also renamed the computer).
Take the computer to your company's IT department for repairs.
--
Bruce Chambers
Help us help you:
http://support.microsoft.com/default.aspx/kb/555375
They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety. ~Benjamin Franklin
Many people would rather die than think; in fact, most do. ~Bertrand Russell
The philosopher has never killed any priests, whereas the priest has
killed a great many philosophers.
~ Denis Diderot