Uninstall Delphi 3 using the following five steps: Back up all project files; Optional: back up aliases by backing up idapi32.cfg, using it to replace the newly installed idapi32.cfg after reinstallation; It is recommended that all third party and custom components be reinstalled after the complete reinstallation of Delphi 3; Use the windows add/remove programs utility to remove Delphi 3, answering "yes" to remove all files; Manually remove the "Delphi 3" directory from your system. Install Delphi 3 using the following five steps: 1. Insert the Delphi 3 CD into CD-ROM Drive; 2. If auto-play is enabled, the Delphi 3 Setup Launcher will automatically run. 3. If the Delphi 3 Setup Launcher does not automatically run, run the file install.exe in the root directory of your Delphi 3 CD; Follow the on screen instructions to install Delphi 3; 4. From Optional Uninstall #2 above: back up idapi32.cfg by copying over the newly installed idapi32.cfg; 5. Install all third party and custom components.