When I updated to Windows 8.

When I updated to Windows 8.1 my Delphi 2007 installation broke. I could no longer open projects in the IDE and my command line compilation scripts also stopped working. It turned out that some files that were added by the installer to the dotNET framework were missing. In addition there is a known problem with Delphi 2007 on 64 bit Windows (starting with Vista).
http://blog.dummzeuch.de/2013/11/10/delphi-2007-on-windows-8-1/