I am experiementing with Vista. It is a factory fresh install on a notebook. I removed all 2007 MS stuff and installed Office 2003 Pro instead. After a few days. I trid to apply update patches via WSUS. The updates did not work. Now I realized that I have lost Windows Installer on the notebook. I don't seem to be able to locate Windows Installer 4.0 to recover my problem. Whenever I try to send a message in Outlook, it will start Windows Installer and fails. The notebook is not in "working" condition. Can someone help? Thanks.