Without these, brightness/volume keys may not work.
The Sony Vaio PCG-31311M (often identifiable as part of the VPCEH series, such as the VPCEH3B1E) is a robust mid-range laptop from Sony's "E Series" lineup. While it shipped with Windows 7, performing a clean install or upgrading the operating system often results in missing drivers—specifically for the Function Keys, Memory Card Reader, and Graphics. Sony Vaio Pcg-31311m Drivers Windows 7
Without these, Windows 7 will run, but: