selected iso file is not a valid iso file (SOLVED)

selected iso file is not a valid iso file fix for windows 7-8
software used
---------- Poweriso editor (See this video to install, register PowerIso for free: How to install power iso and register... )
---------- Windows USB DVD tool
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• #howto_style
• #selected_iso_file_is_not_a_valid_iso_file
• #windows_7_operating_system
• #iso_invalid
• #invalid_iso_file
• #how_to_install_windows_8_from_iso_file
• #windows_8_operating_system
• #install_windows_7_from_usb
• #not_a_valid_iso_file_windows_7_usb
• #iso_file_is_not_valid
• #iso_image_is_not_bootable
• #iso_image_is_invalid
• #iso_is_not_valid
• #invalid_iso_file_problem
• #install_windows_8_from_usb
• #bootable_pendrive_for_windows_7
• #make_bootable_usb_windows_8
• #make_bootable_pendrive_for_windows_8