i have a 64 bit HP n=machine with a G620 intel process. Trying to install windows 8 pro using the following iSO - en_windows_8_x64_dvd_915440.iso. (verified using hashcheck) The install process asks a key. Enter - XKY4K-*****-*****-*****-CRYQH. After a couple of minutes get a message that the key is not valid. Help. What am i doing wrong?