If you still love to developing with Delphi 7 and you're using Windows 7. Here's the tricks on how to install it.
1. Make sure you run the install.exe as Administrator.
Because it will pop an error message like this. And it will pop the error message whenever you want to start a new application.
And right click on Delphi 7 Folder, choose Properties. Uncheck Read-only Checkbox and click apply.
6. Next, click the Security Tab, click on Users, and click Edit button to change the permission for user to allow full access...
7. Click OK button, to close it. And you can run the Delphi 7.
If Delphi 7 still pop up the Incompatibility Issue message, Just click the Don't show this message again checkbox and run the program.
The installation of Delphi 7 is now finished.
If you are having trouble of using Delphi 7 Winhelp. Please read next solution to fix delphi 7 help system.