How to Hook a process as soon as it starts and check if the hook is active.

I have an application that consists of a windows service that is hooking the windows print spooler process. 
I'm having a problem, sometimes, for some reason, the spooler restarts, and the hook is lost. 
What is the best way of monitoring if the hook is active in the hooked process and to hook this process as soon as it starts? 