I have a problem with my Acer 3820TG machine running Windows 7 (and dual booting with Ubuntu 10.04).
When I try to boot Windows 7 I see an error:
Window failed to start. A recent hardware or software change might be the cause. To fix the problem:
2. .... ... status : 0xc000000f info : The boot selection failed because a required device is inaccessible
I can't exactly remember what my last actions were on Windows. I already searched this error and applied the proposed solutions, I created a repair USB (because I don't have a CD-ROM nor a Windows 7 CD) such as:
- Repair operating system - it says it cannot repair it
- Checking disk (
chkdsk D: /f /r) - it checks the disk without a problem or error and it takes a pretty long time (more than a hour). However when I restart, I still have the same error.
- I didn't create a restore point so I pass this option
- I don't have a system image
I tried to run Windows Recovery (I have a recovery partition) but there are just two options:
Format the operating system but retain user data (copies the files under users to c:\backup folder, but when I searched deeper I found that there are some people who already tried this option and couldn't find their user files under backup directory). Plus, I have unfortunately just one partition D (it is a fault I know) because I use always Ubuntu. So this is not applicable in my situation
Format the entire system (Windows). I keep my valuable data in Windows but not in the user folder. I was reaching them from Windows.
I tried to repair Windows boot by:
bootrec /fixMBR bootrec /fixBoot bootrec /rebuildBCD
I lost all Grub menus, so reinstalled it. http://ubuntuforums.org/showthread.php?t=1014708&page=29 - nothing changed, same error.
I created a thread in the Microsoft Forums: http://social.answers.microsoft.com/Forums/en-US/w7install/thread/69517faf-850a-45fd- 8195-6d4ed831f805 - however I couldn't find a solution.
Before I run chkdsk from the USB repair disk I wasn't able to mount the Windows (NTFS) partition from Ubuntu. I was getting a "couldn't mount file system, error code 2" error. I tried to fix the NTFS partition from Ubuntu but got a "segmentation fault". I also created a thread on ubuntuforums for this mount problem: http://ubuntuforums.org/showthread.php?t=1606427
After chkdsk, I was able to mount the Windows partition but all I see in this partition is chkdsk logs, no any other data.
I don't think I lost my data because I didn't get any filesystem errors, just the boot section, but this log files under the Windows partition makes me afraid.
Microsoft developers don't have a solution yet for this error.