> Source: [sk165372](https://support.checkpoint.com/results/sk/sk165372)

# sk165372 - "INACCESSIBLE_BOOT_DEVICE" Blue Screen Of Death after uninstalling Full Disk Encryption blade

| Property | Value |
|----------|-------|
| Solution ID | sk165372 |
| Date Created | 2020-03-02 |
| Last Modified | 2020-03-03 |
| Technical Level | Advanced |
| Products | Endpoint Security |
| Versions | Cloud, E89.X, E88.X |

## Symptoms

- * Uninstallation of the Endpoint Security Client from a machine that is encrypted with Full Disk Encryption resulted with "INACCESSIBLE_BOOT_DEVICE" Blue Screen Of Death. 
  ![BSOD](https://sc1.checkpoint.com/sc/SolutionsStatics/sk165372/inaccessible-boot-device-error20200221134418.jpg)

* Issue occurs on encrypted machines which Windows 10 OS was upgraded to a newer build version.

## Cause

After Full Disk Encryption uninstallation there is a left-over in a registry key for filter-drivers. The 'prot_2k' driver is not removed from the key-value.  
This is because after the Windows upgrade, the registry key-value changes from *'prot_2k'* to '*Prot_2k* ' ('P' letter changes from lower case to upper case) and the removal code is case-sensitive.

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## Solution

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