aidenkael :
Here is the situation. The company I work for aquired another company and has charged me with loging into the machiens and pairing them to our domain. Now, al the machines where fairly easy to do, except for the one windows XP machine. How do I log into a different domain then what it has in it's drop down list? I tried \\DOMAIN\username, no luck.
You can't join to two separate domains. Not without third party software or running a vm and having the vm on a separate domain...
IF you want to change the domain then your going to have to login to an admin account on the "local" machine (not the domain) and just join it from there. It'll prompt for admin authentication from someone within your companies network which I'm assuming you have... Who gave you such instructions? Are you certain they asked you to try to join to two separate domains? Or did they want you to switch the domains to your companies....
IF that's the case you wouldn't do that at login. I don't know the path for xp, haven't messed with in a long time. But win 7 would be start > right click my computer > properties > advanced system settings > Computer name > Change > then change the domain in the domain slot.