"The server process could not be started because the configured identity is incorrect. Check the username and password"

I have QT Pro Version 9.0 Build 2462.

I an getting this error when i try to launch the Quick Test application from a batch (.bat) or a VB EXE.

Can you some throw some light as my user has full rights on the box.

Historically the same VB EXE was working on the same box, but the only difference was, it has the previous version of Quick Test Professional.