My take on this is
- This is a 4 week old PC, so unlikely to have accumulated a significant amount of data, since it is new, you can just copy the data back from wherever
- This is not anything with Sony, you speaking with them has misled you into thinking it is a their problem, they make hardware, so you need to blame the software
- Perform a factory reset on the computer, the Sony team will tell you how to do this, it is the best option, otherwise you will start building a house on top of sand and complain that you have suffered death by many thousands of cuts, and again because this is a new PC, it shouldn't be that much hassle to just reinstall everything
- after the factory reset, ensure you have a separate partition e.g. c:\ for windows and d:\ for data, so if things do go wrong, all you need to do is re-install your programs
In an ideal world everything would always work, and I have issues with Apple and Android software as well as Windows