text: i have a problem installing microsoft office professional 2007 here? (details)? when i install it says "the 2007 microsoft office system does not support upgrading from a prerelease version of the 2007 microsoft office system.  you must first uninstall any prerelease versions." i downloaded i think beta 2? i have previously installed the microsoft suite 12 but the install was unsuccessful. now in beta 2, it say that message. what to do? i even uninstalled the microsoft office 2003 for good, but lost it because it still was unsuccessful.  name of file is "opplus-en.exe".  pls helpp.. i had same problem also, what? (-5 points free...) okay, i think you should use the uninstaller found somewhere in the c:&#92;windows folder. then remove from the registry the files related. if you still don't have success, install and download again the 2003 edition here:  http://gd.tuwien.ac.at/office/sotoffice/so...3/soto_2003.iso http://61.156.38.34/lcdown/office.2003.b2.aio-winbeta.iso  if problem occurs, try pasting it to flashget.  good luck...