My PC specs: Asus P8Z77-V with a SATA2 WD Caviar Black 500GB. The HDD has three partitions, and I've had Windows 7 32 bit installed on C:/ for three years.
Before installation, the BIOS has Secure Boot and CSM enabled.
Yesterday, I cut D: into two partitions, and use the second to install Windows 8.1 64-bit through a DVD. The installation went perfectly fine, and the new OS works wonder. The partitions now look like this (all primary, C is active):
C:/Windows 7 <> D:/Stuffs <> E:/Windows 8 <> F:/Stuffs
However, whenever I try to boot into Windows 7, I always receive an Windows Boot Manager error of "0xc000000f A required device isn't connected or can't be accessed".
- First thing I done was popping in a W7 repair disc, however no problems were reported.
- Then I disabled fast startup in W8, however it still uses the hiberfi.sys file.
- I started msconfig in W8, and choose W7 as the default OS. Nothing changed.
- Disabled Secure Boot and enable CSM to support both UEFI & Legacy in BIOS. Nothing changed.
- Aligned partitions and rebuilt MBR in partition wizards. Nothing changed.
I give up. I have tried every option possible. The only fix options I found left was winload.exe, bcdedit or using easybcd. I'm going to give it a shot but can't guarantee how will it turn out. Should anyone help me with this specific problem, I'd be greatly appreciated. Thanks for reading.
Before installation, the BIOS has Secure Boot and CSM enabled.
Yesterday, I cut D: into two partitions, and use the second to install Windows 8.1 64-bit through a DVD. The installation went perfectly fine, and the new OS works wonder. The partitions now look like this (all primary, C is active):
C:/Windows 7 <> D:/Stuffs <> E:/Windows 8 <> F:/Stuffs
However, whenever I try to boot into Windows 7, I always receive an Windows Boot Manager error of "0xc000000f A required device isn't connected or can't be accessed".
- First thing I done was popping in a W7 repair disc, however no problems were reported.
- Then I disabled fast startup in W8, however it still uses the hiberfi.sys file.
- I started msconfig in W8, and choose W7 as the default OS. Nothing changed.
- Disabled Secure Boot and enable CSM to support both UEFI & Legacy in BIOS. Nothing changed.
- Aligned partitions and rebuilt MBR in partition wizards. Nothing changed.
I give up. I have tried every option possible. The only fix options I found left was winload.exe, bcdedit or using easybcd. I'm going to give it a shot but can't guarantee how will it turn out. Should anyone help me with this specific problem, I'd be greatly appreciated. Thanks for reading.
My Computer
System One
-
- OS
- Windows 7 32bit & Windows 8.1 64 bit
- Computer type
- PC/Desktop
- CPU
- Intel Core i5-3350p
- Motherboard
- Asus P8Z77-V
- Graphics Card(s)
- Asus GTS 450 Direct CU II
- Monitor(s) Displays
- Acer G195HQL
- Screen Resolution
- 1400x900
- Hard Drives
- Caviar Black 500GB
- Keyboard
- Tt Esports Challenger Pro