René has been saying the same thing over and over, but for some reason you are not understanding him. On the Preferences page above, where it says 'Color Matching settings', you have sRGB checked. You should have one of the other two options checked, but if you check the third one, Monitor profile, you will have to browse to your monitor profile and select it and I'm not sure, given your difficulties, that you can do that. So you're lucky you have a Windows system because that gives you the second row to check, something that Mac people don't have (see René's last post). The reason that checking sRGB is not good here (although it is a good choice in the top section) is that it effectively turns off color management - it makes DPP behave like all those other lame, non-color managed programs; Windows P & F Viewer, Internet Explorer, etc. The middle choice, using the OS setting, is what LR does automatically, so now they will be on the same page.
But, and it's a big but, if we have told them to use the OS setting, we should know what it is. So here's how we find out.
1. Do a right mouse button click on some part of your desktop where there are no icons and select Properties.
2. A box will open that says Display Properties on the top. Select the last tab, Settings, and then the button Advanced in the bottom right corner.
3. On the new box choose the tab that says Color Management. In the middle of the box it will say "Default monitor profile:"
4. Please write down what it says is the default profile and post it here.