I have a dual boot system with Windows 7 (office) and Windows 10 (games). These are installed to 2 separate SSDs. There is also a third shared data drive. This has all worked fine for a number of years with the Windows Bootloader menu.
I was tinkering with the CSM in the BIOS last week to try and resolve an unrelated issue when I found I was unable to POST the machine. I did succeed in recovering the BIOS, and the settings are now back to default with CSM enabled. I was subsequently able to boot into Windows 10, but I am no longer able to boot Windows 7.
Windows repair tool gives an error of "boot configuration file corrupted". I have a working entry in the boot menu, and I see the Windows logo appear but that is all. In safe mode it loads some drivers and fails. I can see all the data on the disk from the other OS and the disk does not register any errors.
I have worked through the options in Easy BCD. Resetting the BCD configuration made the PC unbootable but I was able to recover this by allocating drive letters to the necessary volumes and manually rebuilding via the command prompt (using an installation disc).
I am guessing I am now at the end of this journey and need to reinstall 7. How will I need to set things up to be able to boot into Windows 10 ? Both disks are GPT. The EFI system partiton is on the 1st drive with Windows 7.
I've had my share of dual boot dramas over the years but this EFI has stumped me. Any help gratefully received!
I was tinkering with the CSM in the BIOS last week to try and resolve an unrelated issue when I found I was unable to POST the machine. I did succeed in recovering the BIOS, and the settings are now back to default with CSM enabled. I was subsequently able to boot into Windows 10, but I am no longer able to boot Windows 7.
Windows repair tool gives an error of "boot configuration file corrupted". I have a working entry in the boot menu, and I see the Windows logo appear but that is all. In safe mode it loads some drivers and fails. I can see all the data on the disk from the other OS and the disk does not register any errors.
I have worked through the options in Easy BCD. Resetting the BCD configuration made the PC unbootable but I was able to recover this by allocating drive letters to the necessary volumes and manually rebuilding via the command prompt (using an installation disc).
I am guessing I am now at the end of this journey and need to reinstall 7. How will I need to set things up to be able to boot into Windows 10 ? Both disks are GPT. The EFI system partiton is on the 1st drive with Windows 7.
I've had my share of dual boot dramas over the years but this EFI has stumped me. Any help gratefully received!