I came across a challenge that prevented my Windows 10 computer from booting. The issue arose when I uninstalled Paragon HFS+ special edition and installed Paragon HFS+ trial, after reboot my computer would not start and gave the following blue screen error:
Inaccessible_Boot_Device
By referencing a number of sources I was able to reach a solution that allowed my computer to boot. In my solution I used a USB hard drive dock to mount the existing drive as a USB device which allowed me to use another windows PC to decrypt the bitlocker drive.
The solution:
You will need to delete some files and modify some registry keys. Proceed at your own risk. Make a backup of the registry hive and the files:
- %windir%/system32/drivers/gpt_loader.sys
- %windir%/system32/drivers/mounthlp.sys
- %windir%/system32/drivers/hfs*.sys (search for hfs*.sys)
From the registry’s SYSTEM hive delete keys and folders pertaining to the keys listed below1.
- apmwin
- gpt_loader
- csvol
- cs_vol
- hfsplus
- hfsplusrec
- mounthlp
I did this by searching through the hive for each key. A number of keys had text pertaining to other stuff, so be careful to edit the keys and delete things only pertaining to what is listed above.
Also, here’s a guide for opening a registry hive from a slave drive.
It may also be possible that just deleting the files or registry entries alone may be a fix, itself. If you get a chance try deleting just the .sys files and leave a comment whether that was successful.
where is that directory(ies) located?
The %windir% directory? In C:/Windows, usually. But if you type %windir% in run or explorer or anywhere it will take you right to %windir%
Thanks for this – I broke my WIndows 10 installation after installing Paragon HFS+ to access an external HDD. Couple of mistakes:
* The sys files are in %windir%/system32/drivers
* It’s csvol, not cs_vol
However, after following the guide I was still unable to boot into windows. I then discovered while screwing around in the recovery console that windows keeps a backup of the registry hives in %windir%/system32/config/RegBack. I copied the SYSTEM hive from RegBack (which was only 5 days old) over the one in config, and now I’m back in.
Thanks for the corrections! I wrote this from memory and made a few mistakes. Your comment will surely help others find a resolution.
Thank you so much James. You’ve saved for my life. I am eternally grateful.