I am usually reluctant to mirror other blogger’s contents or just post links but in this case I decided to make an exceptional exception. “Black Viper” (sounds like a gamer tag isn’t it?) published a comprehensive guide over Windows Server 2009 R2 and windows Seven System Service configuration covering all OS flavors. Have a look at it prior starting any optimization or hardening work!
Previous Windows versions are also available btw.
From Hervé Schauer Consulting you might also find this (blast from the past, read “up to XP/Server 2003”) set of information useful: