COLGeek :
What exactly are you trying to change? And, why?
Hello, thank you for your reply.
I am trying to change my IDE ATA/ATAPI controllers in Device manager from PCI IDE controller to an AHCI for optimal performance of my SSD. I am using this tutorial - http://www.tomshardware.com/answers/id-3285661/switched-ssd-windows-wont-boot-ahci.html. This tutorial needs to change the registry but every time I reboot all the settings are reset.