1.Application Experience
2.Computer Browser (If your computer is not connected to any network)
3.Desktop Window Manager Session Manager (If you don't use Aero theme)
4.Diagnostic Policy Service
5.Distributed Link Tracking Client
6.IP Helper
7.Offline Files
8.Portable Device Enumerator Service
9.Print Spooler (If you don't have Printer)
10.Protected Storage
11.Remote Registry (Always disable it for Security purposes)
12.Secondary Logon
13.Security Center
14.Server (If your computer is not connected to any network)
15.Tablet PC Input Service
16.TCP/IP NetBIOS Helper
17.Themes ( If you use Windows Classic theme)
18.Windows Error Reporting Service
19.Windows Media Center Service Launcher
20.Windows Search (If you don't use Windows Search feature frequently)
21.Windows Time (If you don't want to update system tray clock time using Internet)