However, this program has been discontinued and it can no longer be found on official Microsoft sites, except for Windows 7 Service Pack 1. Previous versions of Windows such as Windows XP, Vista, and Windows 7 used the CheckSUR tool in order to check whether their system is ready for the update.If you want to take a look at detailed instructions on how to operate this tool, check out our article on the topic. This can be quite useful if you need those files for the updating process since the ERROR_SXS_ASSEMBLY_MISSING appears if there is a problem with one of your system files. The tool will scan your Windows system files for broken or missing files and it’s able to fix or replace the files instantly. Use the SFC.exe (System File Checker) tool which is accessed via the administrative Command Prompt (the same as DISM tool).If you want to take a look at detailed instructions on how to operate this tool, check out our article on the topic: The tool can be used to scan and check your Windows image for errors and inconsistencies.

This tool is particularly useful if you want to check whether your system is ready for the following update.

Run the DISM (Deployment Image Servicing and Management) tool.Make sure your follow the instructions below in order to fix this. This is especially valid if the error code is displayed next to the ERROR_SXS_ASSEMBLY_MISSING message. This problem may occur if some of the system files necessary for the update are either missing from your system or if they are corrupt and can’t be accessed.

Solution 1: Some of the System Files Are Either Missing or Corrupt

Windows 10 update 0x80073701