Sensor Fails to Uninstall with 800700c1 Error on Windows 11.

Products

• Carbon Black EDR

Issue/Introduction

Sensor fails to uninstall from add/remove programs, uninst.exe or the console. 

In the %temp% folder the cb-<version>-uninstall.log shows the following error. 

Tid[1E54] 2026-01-20 20:22:13 (i): Uninstaller C:\Windows\CarbonBlack\uninst.exe /S failed with 800700c1

Environment

• Carbon Black EDR Sensor: 7.4.2 and Lower
• Microsoft Windows: 11 

Cause

The uninst.exe is unsigned when installed directly from the installation package. 

Resolution

There are two options:

1. Upgrade to the 7.5.0 windows sensor then uninstall. 
2. Copy the C:\Windows\CarbonBlack\uninst.exe from a 7.5.0 machine into the same directory on the machine being uninstalled. 

Additional Information

• Contact support for the uninst.exe if these options are not available.