Hello, I have an old computer I got at the beginning of high school. Its a Pentium 4. I have a little money to upgrade, I think I want to get a motherboard and processor. But my first main question, the computer I have right now is alienware, so the windows I have came pre installed. Do I need to reformat my hard drive before adding new hardware? Or could I simply just install the new stuff along with their drivers and be good to go.