Now I'm facing a problem again. I have two office CDs, one is office 2000 personal, anther is office XP pro UP-GRADE version. Normally, I need to install one apps of office 2000 before I install Office XP Upgrade. Now I would like to install Office XP pro Upgrade with Unattended install DVD. I used 2000 reg file to support Office XP installation, but it does not work. Is there anybody who has experience about "Office Up-grade install" ?