I have a windows vista operating system and a generic pnp monitor on NVIDIA GeForce 7150M/630M. I am wanting to change my refresh rate. It is set on 60 and I can't find a way to change it to maybe a 75 or higher. My eyes always start to hurt about 5 minutes after I have been on the computer. I have tried to update the drivers, but it says that they are all up to date. Can the refresh rate be changed?