Hello, new here, first post.
The truth is here somewhere, HELP!
Windows 7 home Premium
HP p6320y
AMD Phenom II X4 820 2.8GHz
8GB RAM
Radeon HD 4670

I installed Windows 8 on a separate drive and for me to get it to boot I need to change to IDE in the bios. If I want to go back to Windows 7 I need to go to msconfig and change my default OS to Win7 before I leave Win8 and restart. I then need to enter BIOS and change back to AHCI.

While running Win7 in the Registry Editor under System/CurrentControlSet/services I have a
amdide
amdsata
msahci


While running Win8 in the Registry Editor under System/CurrentControlSet/services I have a
amdsata

and not the other two.

Does anyone one know if these values can be added with maybe a hot fix to the win8 registry? And if so would that allow win8 and win 7 to run in ACHI setting? Or would I be left with a smoking conversation piece?

I found this Mr Fixit, but would like a nudge from someone knowledgeable before trying.

Would this Mr fixit do it? Microsoft Fix it 50470
Error message occurs after you change the SATA mode of the boot drive