HMMM that there is a strange one for sure. once recognized you shouldn't have to redo it everytime what OS you using?
It is indeed a strange problem. I'm sorry to haunt you with it as well. I'm using Win XP Pro with SP2 and fully up to date.
It is so strange to me that it recognizes the devices, but fails to install until I tell it to do so. It already has the drivers obviously!!!
If I unplug a mouse and plug it back into the same USB port, no problem. But if I try to switch ports... I get the stupid exclamation mark again.