Logon to the laptop and connect to the internet.
Run this scanner and it will tell you which RAM and what speed etc can be installed on the laptop:
RAM Memory Upgrade: Dell, Mac, Apple, HP, Compaq. USB drives, flash cards, SSD at Crucial.com
Please note matching pairs must be installed.So if 1 gig is fitted now you need to buy the same sized and speed etc.
Then download the graphics card driver from here by filling in your graphics card make and model and OS.Download and install:
Drivers - Download NVIDIA Drivers