: Sony officially provides support for Windows 7 (the original OS) and select Windows 8/10 updates.
Located on a small sticker on the bottom of the laptop or inside the battery compartment. For the PCG-31311L, this is usually VPCYB15KX , VPCYB25KX , or VPCYB35KX . sony pcg31311l drivers
If Windows drivers become impossible to find, consider a lightweight Linux distribution (Xubuntu, Linux Mint Xfce). The PCG-31311L has excellent Linux support – all hardware (WiFi, graphics, audio, Fn keys) works out of the box with kernel 5.10+. : Sony officially provides support for Windows 7