What do you mean by "I opened a command prompt"? In Windows, if you dig around on your menus that pop up when you click the start button (possibly under All Programs | Accessories | System Tools) you will find a program call Command Prompt. Choosing this will give you what is recognised by most experienced computer geeks as a DOS window. Open that, navigate to your chosen directory with the 'cd' command, then use one of the commands given above.
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