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: ) ---------- Windows USB DVD tool these are the popular key woards 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 make bootable pendrive for windows 8 and windows 7 *******write query in comment**********