Dual Boot Win8 OEM, Win7 OEM SUBJECT /Purpose: Adding Win7 to a EXISTING WIN8 OEM install , (Win8 being pre-installed by OEM, HP which uses the GPT partitioning scheme, along with "Recovery" partition(s) ) WITHOUT HAVE TO WIPE THE DRIVE CLEAN. Reason for being wordy is while I hope I can get some assistance on "my" problem, I hope this thread might help someone else who's searching later. I have found VERY little info about adding WINDOWS 7 to a WINDOWS 8 OS install, and even LESS info about adding WIN7 to a OEM WIN8 OS install preinstalled by the OEM. All the threads I've run across are about adding WIN8 to a WIN7 install, Or stating that you have to wipe the hard drive clean and start all over. Hello all, confused on a couple of things. I've spent more hours than I care to admit researching the below. At this point I'm chasing my tail. As I have no interest in "Win8" pretty much this doesn't help. Situation: Elderly parents purchased a HP Laptop with Win8 x64 Core on it. Stepmother got all excited reading about Win8.... and is unable to use it. Because of this I want to "upgrade" them to a OS they can use (And that I can help them with). I would prefer setting it up as a DUAL BOOT (Win8/Win7), 2nd option is straight Win7. I have backed up the MSDM keys, Extracted OS build /type info (Core/English). I and familiar with changing the OS sku from Win8 to Win7 to make the Win7 install validate properly using OEM Win7 key. I have a 8.1 iso image and have "read" you can do a fresh install with a generic OEM key, then inject the MSDM key extracted from the install once OS is installed. (Is this correct? Most info states you have to have 8.0 iso which is not available freely.) I'm wondering if changing the sku will deactivate the current Win8 install. In other words once the OS is activated does the OS check the bios after that. I've searched high and low- nobody can verify if the OEM install will freak out after toggling the sku to Win7. I would assume the OS does, would be nice if it didn't as it would allow setting up a dual-boot. (My stepmother is the type if I was to wipe clean Win8 and do a straight Win7 install, even if she couldn't use Win8 she might hold it against me if it was "gone". Hence why a dual-boot is preferable.) ******************** Has anyone been successful in doing a Dual-Boot Win8/Win7 as I describe? All the posts I've read were focused on just wiping Win8 off the machine totally, sku in bios being set for Win7 so Win7 would validate. If so next question will be about if the "Hidden" MBR which is within the EFI? "GPT" partition (Or elsewhere) can be reset without re-installing Win8 so the Win8 and Win7 will boot properly. In the bios. Secure boot is disabled. CSM Mode is ON Dual Booting is a COMMON practice, With 90% of Win8 PC's being shipped with the OS pre-installed and pretty much all you can get on consumer PC's is "Win8" which alot of people don't like, OR they need Win7 to run their apps I am amazed at the lack of any concessions, or considerations, forthought Microsoft and the OEM's have put into making adding Win7 to a Win8 OEM install. You'd think the process would go something like: Stick your 2-3 yr old Win7 install media into DVD drive while in the Win8 OS. You run SETUP on the disc if it doesn't automatically come up, Win8 detects the media and asks you what you want to do. You click INSTALL. Win8 reboots the computer, setup runs and at the completion of setup it asks you want OS you want as the default OS... and you're DONE. Partitioning software can be run from within the OS, you select what operations you want to do and it reboots the machine adding the correct parameters. Why can't Microsoft and the OEM's have a app that detects Win7 install media, and install it? WIPE ALL the PARTITIONS off the drive to install Win7? What happens if the files within the "hidden mbr", or whatever becomes corrupted in a Win8 install and you have data on the drive? Seems like they would have a app that does as in the old days that scans the hard drive for a prior OS and adds it. Appreciate any thoughts on the subject. .