I already installed windows server 2003 enterprise edition for my company and all necessery services now working properly.but from 4 days ago when I wanted to log on to windows a popup message appeared that tells :"this copy of windows must be activated with microsoft ..." and have3 choices, one is yes that guid me to a new window for activating windows but it mentioned that : "windows is already activated ..." and when i click ok,windows logged off and so on, and the second is no that log me off and third is cancel that shut the windows off.but still i can log on to windowsthrough safe mode but ican notaccess my network and my clients also.I m confusing abuot that and search but nothing find.I also find the link for microsoft that guide through safe mode but it was not helpfull for me cause problem still remain.I mean this link : http://support.microsoft.com/kb/312295

This forum is for Windows Server 2008. Please post your question in the Windows 2003 newsgroup. You'll find it here: http://technet.microsoft.com/windowsserver/bb841405.aspx