Windows 10: Dual boot installation with Win 7 + 10 -- multiple issues

  1.    19 Jul 2015 #1

    Dual boot installation with Win 7 + 10 -- multiple issues

    I wanted to experiment with Win 10 while preserving my Win 7 x64 installation. I imaged my Win 7 to a new hdd which is formatted as GPT. I repaired the Win 7 copy using a Win 7 SP1 installation dvd and got it to boot in UEFI mode using the "Windows Boot Mgr" option in the BIOS boot menu. So far so good.

    My original plan was to keep my Win7 install on the original MBR disk and upgrade the copy on the GPT disk to Win 10. Within the running copy of 7 I ran setup.exe on the Win 10 x64 Build 0162 dvd. It started checking the PC, but after a minute failed with the error msg "Setup has failed to validate the product key." This happened before any prompt to enter the Win 10 ISO key. My Win 7 key is valid "Genuine Microsoft", so I don't know what's going on with that.

    Search for that error suggests corrupted Win 10 install media, so I tried clean-installing Win 10 to a separate partition on the new drive. It installed successfully. On reboot, I am presented with a new Win 10 boot menu that offers the new Win 10 by default, as well as the Win 7 copy on the GPT drive. During the Win 10 install, the new drive was the only one in the system. After installation, I reconnected one of the other drives. Win 10 will still boot, but the Win 7 option on the boot menu fails with error 0xC0000225. Since it would boot when only one drive is installed, I'm wondering if there's a drive numbering problem involved.

    Is there any way under Windows 10 to view and edit the entries in the UEFI Boot Manager? On MBR disks I used EasyBCD to maintain the boot entries. I remember on XP having to change the drive numbers in boot.ini when drives were moved or added. How do you do that for UEFI boot? (EasyBCD does not support UEFI.)

    The last issue had to do with ChkDsk running after I booted off the MBR drive to my original Win 7. I suspect that is caused by the "Fast boot" option in Win 10 being on by default. I've seen that problem before in dual-boot scenarios when hiberfile.sys is used by an OS on shutdown. I saw how to turn off Fast Boot, but I haven't tried it yet.

    I appreciate any advice on the upgrade issue and the drive# issue in the Boot Mgr -- thanks.
      My ComputerSystem Spec

  2.    19 Jul 2015 #2

    Found this on the TechNet Win 10 forum, just posted a few minutes ago:

    Microsoft has deactivated all pre-release product keys published earlier for builds of Windows 10 Insider Preview and they won’t work on any Preview builds, including Build 10240. Microsoft is not supporting clean installs of Windows 10240, which is only intended to be installed as an upgrade from a previously-activated version of Windows 10 Insider Preview
    That's the most likely explanation of the key validation issue. That leaves the boot menu issue to resolve.
      My ComputerSystem Spec

  3. Posts : 91
    64-bit 10240 10 Pro
       19 Jul 2015 #3

    kaborka said: View Post
    Found this on the TechNet Win 10 forum, just posted a few minutes ago:

    That's the most likely explanation of the key validation issue. That leaves the boot menu issue to resolve.
    All pre-release Win 10 Insider Preview prod keys have been deactivated - Windows 10 Forums
      My ComputerSystem Spec


Related Threads
I installed the 10 tech preview along side my win 7 ultimate, I reinstalled, the Windows 7 side of the HDD because after however many years the OS had a LOT of clutter, and even though windows update was a nightmare I finally got all the updates...
Solved No boot menu on dual boot WIn8.1↔10 in Installation and Upgrade
HIYAS I have installed Win10 on secondary partition while keeping Windows 8.1 as primary. Everything went fine, after few reboots Win 10 was ready to use. After setting up things I rebooted, In boot manager I have two entries - Windows 10 as...
Dual boot 10 & 7 BIOS/UEFI possible issues in Installation and Upgrade
I dual boot to 2 different windows 7 installs. I have my primary for day to day stuff and the second install is for my DAW. I don't want to update the DAW to 10 because of the issues it may cause. I do want to update my primary install to 10. Can...
Convert dual boot install to normal boot in Installation and Upgrade
After several weeks of testing I'm ready to go full on Windows 10 and want to get rid of Windows 7 but I have some partitioning issues I want to clean up. I currently have Windows 7 on drive 0 (360 GB) and Windows 10 on drive 1 (500 GB). Both are...
dual boot win 10 ent with win 10 pro in Installation and Upgrade
I have the win 10 enterprise preview edition but want to end up with the pro version. Can these 2 be installed at the same time?
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 07:28.
Find Us