I had a case where the Help and Support service did not exist. Below is how to fix this problem.
Nagivate to C:\Windows\System32\HelpCTR and rename the PackageStore folder to anything. I put it as PackageStoreold.
Next open a command prompt and navigate to C:\WINDOWS\PCHEALTH\HELPCTR\Binaries. Run the following command:
start /w helpsvc /svchost netsvcs /regserver /install
After this the health and support service should now exist again, simply start it.