The "Microsoft Management Console" (MMC) is one of the lesser-known elements of Windows 2K and XP; items with the "msc" extension open inside the Management Console, and may be altered from there. The MMC is a very powerful way to access and control a huge array of system features and functions.
Type "services.msc" without the quotes on the Start/Run box

More info: Search on "mmc" in Windows' Start/Help function; or see "Step-by-Step Guide to the Microsoft Management Consol" at
http://www.google.com/search?hl=en&lr=&q=Management+Console+MMC
or
http://www.google.com/search?&q=Management+Console+MMC