In Windows 7 there are many unwanted services .Many of these services are not meant for a normal home PC user . You can disable these settings , as per your requirements

1. Application Experience
2. Computer Browser
3. Error Reporting Service
4. Desktop Window Manager Session Manager
5. Diagnostic Policy Service
6. IP Helper
7. Offline Files
8. Portable Device Enumerator Service
9. Print Spooler
10.Distributed Link Tracking Client
11. Protected Storage
12.Secondary Logon
13. Server (If your computer do not connect with any network)
14. Tablet PC Input Service
15. Themes
16. TCP/IP NetBIOS Helper
17. Windows Media Center Service Launcher
18. Windows Search
19.Remote Registry
20. Windows Time
21. Windows security center
22. Windows updates
23. Windows firewall(Provided you have a security software installed)

To disable these Windows 7 services , press Win+R and enter “msconfig ” with out quotes . Now select services from tabs . There would be other services that are not included here . Like that those created by Office , Nero and other softwares . Speed of your Windows 7 desktop will increase dramatically after disabling these services . But care should be taken while choosing the correct service .Else it would bring out the reverse effect .