I have a HP Pavilion g6-1265sa with Pentium B950 in it. When I download graphics drivers then after restarding there will be lines made of black and white dots. After deleting graphics drivers there aren't any dots(it has Intel HD Graphics 2000 in it. My question is, how can I install graphics drivers without getting those dots on my screen?
Do not start messing with the processor. And, as old as your machine is, upgrading the processor would not buy you much. Also, you would have to have HP tell you which processors are supported by their BIOS.
If you are serious about upgrading, I would recommend you look at something current, that is fully supported. Unfortunately, this means getting rid of what you have. So, consider the pros and cons before doing so.