As you are currently away from the ActivBoard it will be difficult to do much troubleshooting. Ideally it it were possible to call us from in from of the ActivBoard and computer we could advise you there and then.
In the meantime however it seems you may have uninstalled the ActivDriver which controls the communication between the computer and the ActivBoard so it may be worth trying to download and install that separately. To download the driver software please go to http://www.PrometheanKB.com and search for article 10902.
(Support case 546096)
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