How to get that internal ip address of PC I?
That's simple, on PC I you can use search in windows, fill in the search window CMD, select command prompt and click on it, in the opening screen.
After the prompt type ipconfig and click enter.
In the new screen that's opened it shows.
In the screen you see the internal ip address you have to use (like mine in the screen).
Use that address like.
Click on validate to see if there is a connection from PC II to PC I!
To hart to open the CMD (CoMmanD Line) screen or find it, ok...
Download a short link for your desktop!
When you have the address, put it in the database setup screen of PC II.