I suspect you either did not install the libraries, had some older installation without libraries or the win7 installer is broken (it is kind of to be expected that the win 7 installer will break at some point as it is no longer supported by microsoft which means also no longer really supported by KiCad)
However it is surely fixable by manually creating the library table or if the footprints are not even on the disk then manually downloading them from github (can even be done using your win 10 pc and transfer it via usb drive or similar to the win 7 machine if you want to avoid connecting it to the internet)
More details
- I installed KiCad 5 (under Linux) but there are no libraries. (The default option for sym lib table setup is disabled) (mostly focuses on linux but will also be aplicable to windows)
- Library management in KiCad version 5