>I have a client that connects to a MSSQL db via remote desktop. A couple of days ago, he was unable to connect to the database. Even I could not connect from his laptop (via Remote desktop) but could from any other work station/laptop, and could get connected as him from other workstations. I know it has to be related to the the laptop, but d*mned if I can figure it out. Any help or sugesstions would be welcome.

You have problem with changed User Rights of the OS.