Have a dell computer with a 500gb HD. The hard drive has win 10 installed which is the free up grade from Microsoft. The hard drive is making strange sounds. I feel the drive is going bad. I have purchased a new drive and want to put the free Microsoft win 10 on the new drive. Do I need a back up of the current drive? I really want a clean install? Any advice or help will be greatly appreciated. Thanks Lowell12.