The Sony support site should have a list of all drivers for all models of Sony computers for download. I would start there.
The sony site only has the drivers for Window 8 for that model.
OP, you can try installing Windows 7 and using driver software, windows update, etc, you should be able to piece most of them together.
If you don't like the Windows 8 tile interface, install a free start button software and run Windows 8 like 7 instead of going through the trouble of buying Windows 7 and trying to find drivers for an OS that is discontinued.