Does your Windows Live Messenger automatically changes the status to busy? Then check out the below steps to disable the automatic status change.
Windows Live Messenger has a feature that will set your Messenger status to Busy and block all incoming alerts when you are running full screen program or when presentation setting in turned on. And by default this feature is enabled in Windows Live Messenger. If you do not want to enable the automatic status change then you turn off using the Messenger Option.
Login to your Windows Live Messenger and select More options from the drop down list.
In the Options window, navigate to Status section under Personal tab. Now un mark the check box with label starting with Show me as “Busy”… . This would turn off automatic status change to busy and blocking of all alerts in Windows Live Messenger.