What does it mean exactly, to disable Libraries? If Libraries are just links - what's to disable?
However, I see that the OP wants to remove Libraries from the navigation pane in Windows Explorer. Indeed it's there and occupies a line. Now, if it's possible to remove them from there, then I actually have a question - is it possible to completely reorganize the navigation pane to one's liking? What I mean is that instead of the simple directory tree, we have a whole lot of artificial constructions - such as Libraries - but most annoyingly Favorites, which takes up three lines on top of everything. Then, the tree starts with Desktop, and that includes Libraries, the folder with my username, which I have no use for, then Computer, Network, and Control Panel, and finally the Recycle Bin. Out of all of these, I only need to see Computer, which is a real directory tree. The Desktop itself might be useful, but everything else just occupies space. I mean, I use Control Panel, would not dream of asking to "disable" it, but I have never once accessed it through that link in the navigation pane. Same with the Recycle bin. Favorites, Network, and My Documents - or the folder with my username now - I have never used in my life. So, can I remove those as well from the navigation pane?