C++ code to disable Windows services

My co-workers (IT Support) have to set up 40 new PCs for our company. I want to help them,so I’ve written a program which sets the PCs

I have a problem disabling the Windows services. When I do it via

sc config service start= disable

then it works on my machine.

But when I add these lines to my C++ program:

system("sc config Wlansvc start= disabled");
system("sc config bthserv start= disabled");
system("sc config Browser start= disabled");
system("sc config Fax start= disabled");
system("sc config HomeGroupProvider start= disabled");
system("sc config HomeGroupListener start= disabled");

Then it doesn’t work on a new machine.

Does anyone have an idea?