Thanks for stepping in Noel
You've got a tailing square bracket on the key name:
REG DELETE HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\ComponentDetect\amd64_netfx-mscorjit_dll_b03f5f7f11d50a3a_22.214.171.124_none_511b60f4fddfa6f9]
And it needs speech marks around the key name as well because of the spaces in Component Based Servicing. I've fixed it, and will use it now
Noels suggestion is perfect here - it will tell us what the error is, assuming there is one. I have amended Noels script, and I would like you to run this from an elevated command prompt (run as admin). Copy the output into your next post please. REG DELETE "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\ComponentDetect\amd64_netfx-mscorjit_dll_b03f5f7f11d50a3a_126.96.36.199_none_511b60f4fddfa6f9" /v "Package_3_for_KB2518869~31bf3856ad364e35~amd64~~188.8.131.52.Trigger_3"
Like last time, it's just one command and should run properly this time as I've fixed the formatting issues we had with the last reg.exe fix we tried.