I'm guessing you took the ArcadeVGA out hook it back up to the computer monitor? And if so that is your problem, they driver looks for the compatible card. But by some crazy chance you do have the arcadeVGA installed I would make sure you have the right drivers (7000 vs. 9200) I say this because I bought an arcadeVGA off a guy cheap cause he said it was the old 7000 series but didnt have the drivers, so I downloaded the drivers and kept getting the message you are getting, it drove me crazy. I finally had the idea to go in to add new hardware to try to force load the drivers, and to my surprise it found the card, but it was actually a 9200 series, so i got the new drivers and it worked like a charm.
But I still think its because the card isnt installed...