I have a HP Z440 Workstation that was delivered from the factory with Win7 @ 64bit operating system and was recently updated, by mistake, to Win 10 . Anyway, I need to restore the OS to Win7 because some apps and softwares that i have does not work on Win10.
I tried to use the CD's with the Win7 SO Image that comes with the PC from the factory but it doesn´t work!!! after turning on the PC starts to read the CD ROM but the message "SELECTED BOOT IMAGE DID NOT AUTHENTICATE. PLEASE ENTER TO ATTEMPT BOOT TO NEXT DEVICE" appears and that´s all... Win10 starts again to run.
I can not access to the control panel also because the administrator account was disabled. :@
Pleas I need Help!!!!
