I only have 111GB in my laptop C Drive. How can I increase the size and add more GB? The only way I know how is to buy an external hard drive but its annoying having an external drive when I need to move my laptop and it is hooked up bu usb. I want at least 500GB in total for the C drive. Are there any other ways to increase it? I cant remove many other programs because I dont have very many to begin with.