Instruktions:

1. Start Windows explorer: Shortcut:"Start" button on keyboard + E or press "start" button on desktop, go to Programs and accessories and press Windows Explorer.

Tips! How to create a shortcut to windows explorer on your "quick launch" bar

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2. Select the files to rename by pressing and holding "Ctrl" key on your keyboard and selecting the files.

3. Press "F2" key on your keyboard and type the new name of your files. (Above picture) Press Return on your keyboard. The remaining files will be having the same name but with (1) and (2) and so on.