i already downloaded the kext file.but it is correct the file that i downloaded with extension htm?the file name is NullCPUPowerManagement.kext.htm.or i should delete htm and so that become kext extension.then how to copy all files from iso to my pendrive so that i can boot from pendrive?i have tried magiciso and poweriso in order to extract all files in iso but poweriso and magiciso give error:extract failed!Can not create directory or file.The disk maybe full or read only..What should i do?Problem comes with another problem..Help,my head is being cracked right now.