How do you no how much giga,mega,bites you have on your computer. I have windows?

Go to your desktop. Double-click My Computer. Find C: (or whatever letter your hard drive is named) and right click. Then select 'properties'. Make sure you're on the 'General' tab. (You should see some words and a big purplish-pink and blue pie chart on the bottom.) It should tell you how many gigabytes; how many gigabytes are left; and the total amount of space you have on your hard drive.