I've had issues with Win7 laptops before, but it all depends on the model of the laptop, and what it's display is capable of, and whether the end user is using it in desktop extension / duplication / remote only mode, etc.
In most cases, switching it to the 2nd screen only mode fixes the issue, and worst case, rebooting it while it's set this way, and it's connected, fixes the problem.
So, from my expereince, it's pretty well always a problem wtth the laptop/user, and very rarely (if ever) a problem with the TelePresence device.
Wayne -- Please remember to rate responses and to mark your question as answered if appropriate.
Wayne -- Please remember to mark helpful responses and to set your question as answered if appropriate.