Does Panel builder 800 ver. 5.1 support Windows 7 64bit?
There is no information about the Windows compatibility regarding the 5.1 but I believe it will work since its next version supports the following operating systems:
You can download the latest files for ABB Panel Builder 800 from its official website. I believe that's an essential place to start with.
You need to upgrade to win 8 or win 10 to make it work better