I recently built my computer and installed Windows 7 on it using a friend’s disk. I disabled updates because it had caused the computer to crash previously. Now, the computer slows down drastically every few days and then crashes. When I reboot, it asks for the system disk. Can I copy the system disk somehow so that I don’t have to borrow it from my friend? And does anyone know the source of the error? I’m using 4Gb of RAM with an Intel Core processor, in case that matters.