Hi, I'll be happy to help with this issue
usually in this instance, the quick fix is to log in with a local administrator account, remove the domain relationship and then rejoin the machine to the domain
is it only the one machine that is showing this - every other workstation is logging on normally?
and what server is the domain running on - 2003/2008?
do you know what the domain controller is running?
ok - do you have any kind of access to the domain controller on the network?
or a local administrator account on this Windows 7 workstation which has the error?
ok - the best solution will be to log in to the affected workstation as a local administrator - can that be done?
ok - if you disconnect it from the network are you able to login with any cached domain credentials?
yes - just unplug the network cable
cached domain credentials should be your username and password
the system should remember them even though it can't communicate with the domain controller
ok - if that lets you in does your account have admin rights?
ok - if so you will need to install this utility
and once installed run this command
netdom.exe resetpwd /s:<server> /ud:<user> /pd:*
where <server> is the name of the domain controller
and <user> is the domain\username
that will force a refresh and reset of the account on the domain controller and allow a new password XXXXX be set
if you can't login when disconnected
then the only solutions will require either a local administrator account
or the computer account in Active Directory to be recreated