When I am trying to install Office 2007 on my Windows Vista OS, then I am getting an error message after the setup is launched that states "Setup cannot continue because a required file is either corrupted or not available. Run Setup again from original source disc or download location." I tried to copy the CD to a System folder and then tried running the Setup from that location and I have also tried to run Setup in Windows XP compatibility mode but nothing worked for me. The system that I am using has all updates installed for Vista. I cannot install other programs on this pc from the same DVD drive and the on another computer the setup will launch from the CD? Can anyone please help me out? Thanks.