Greetings. My daughter's computer is a Compaq 5330US with a P4, plenty of memory, XP Pro SP2 and all updates installed. Her original Compaq monitor was starting to experience symptoms of old age, so I installed a used Dell M781s monitor. The picture quality is superb. The only problem is an error message which appears every time the machine is first turned on: "Windows could not load the installer for Monitor. Contact your hardware vendor for assistance". Click OK and the message goes away and life is good. I am mystified because I was unable to find information about this error on the Dell website or the Microsoft website. I do not have an installation CD with this used monitor, but Windows didn't seem to have any trouble identifying it. Obviously this is not an urgent problem, but I would love to find out the cause and the cure.