Ensure you are downloading the 64-bit (x64) drivers if you have 4GB of RAM or more, as most PCG-31311M units shipped with 64-bit Windows 7 Home Premium.
If the interface feels sluggish, switch to the "Windows 7 Basic" theme to save GPU resources. Sony Vaio Pcg-31311m Drivers Windows 7
Are there specific items in currently showing a yellow triangle ? Do your Fn keys (brightness/volume) currently work? Ensure you are downloading the 64-bit (x64) drivers
The PCG-31311M typically runs on an AMD E-350 or E-450 processor. The chipset driver is the "brain" that tells Windows how to talk to the motherboard. Sony Vaio Pcg-31311m Drivers Windows 7