I am having Windows 2003 server on my network. I had installed the new edition 2005 and activated it. It was a proper upgrade. But this morning when I started the system the activation wizard popup again and it ask for re-activating the OS. I had checked in error log and found a error related to Windows Product Activation. I am doubtful about this problem. I think once Windows is activated we do not require to do that again. Is there some bug with upgrades.