I am trying to install Office 2007 Enterprise on my Windows Vista opearting system. This installation that i am doing is actually a upgradation directly over Office 2003 which was installed previously on my system. So after inserting the dvd and the putting the license key which is very well accepted, the install gets rolled back with an error that states "Error 1712. One or more of the files required to restore your computer to its previous state could not be found. Restoration will not be possible." I have been trying a couple or times to install the new ms office but nothing seems to be working and am getting the same error. Is there anyone who could help me out.