Under Windows 7 you must set \holdem manager\dbcontrolpanel.exe, holdemmanager.exe and hmhud.exe to be started as administrator. Run the windows explorer and navigate to your Holdemmanager installation directory. Right click the executable's and select "Run as admin" from the compatibility tab.
The secondary logon service is a standard windows service which is available on every windows computer. In the latest versions it is not started automatically. You need to start it via control panel > administrative tools > services. Starting it once should insure it works in the future also.