Some people are having problems with MSN's Messenger on Vista when DEP is active. DEP closes the application whenever you try to logon. here are some links where you can find a solution to the problem:http://www.fanatic.net.nz/2007/03/14/how-to-stop-dep-crashing-messenger-on-vista/http://www.acerpanam.com/synapse/forms/portal20.cfm?recordid=1130&formid=3390&website=AcerPanAm.com/us&siteid=7293&words=all&keywords=&areaid=7To turn off DEP all together, try this: http://forum.mess.be/lofiversion/index.php/t20709.html