Register w32tm.exe

During an unsuccessful attempt to sync my clock, I have run the command w32tm /unregister.

When I run w32tm /register I get the error: The following error occurred: The specified service has been marked for deletion. (0x80070430).

How can I register the service again?

You have to stop Windows Time Service when registering it:

1) w32tm /unregister

2) Hit Win+R and type services.msc

3) Find 'Windows Time' service and stop it

4) w32tm /register

5) Start Windows Time Service again.