here is my tip:
Code:
 			 			When we install windows XP, there r many services running in  background. Among them many services r useless and can be set manual to  make our windows faster. 
In this tutorial I'm telling the services which can be safely set to MANUAL. 

How to do it? 

1.) Right-click on My Computer icon on desktop and select Manage, it'll  open a window, in which goto: Services & Application -> Services.  To disable or Set it to MANUAL, double-click on service and select What  u want in Startup list box. 
2.) U can also open the same by going to Administrative Tools and open Computer Management. 

NOTE:- Always set the service to MANUAL, never disable it. So that  whenever windows needs to start a service it can easily start and use  it. If u set ne service DISABLE, then windows can not enable it and will  give ERROR... 
Some service may be system dependent, like setting some services MANUAL  can work on many systems but can make some systems not working if they  required that service to run. Thats why always check the services one by  one, and in case windows gives ERROR, u can re-enable that service by  starting the system in SAFE MODE. 

So here is the list of services that can be safely set to MANUAL (Many of them may be disabled automatically on some systems): 

Alerter 
Computer Browser 
Distributed Link Tracking Client (If u hv NTFS partition, then don't disable it) 
Fast User Switching Capability (removes Switch Users option) 
Indexing service 
Internet Connection Firewall/Internet Connection Sharing 
Messenger 
Remote Registry (Always disable it for Security purposes) 
Secondary Logon 
Server 
System Restore (If u don't use System Restore) 
TCP/IP NetBIOS Helper Service 
Uninterruptible Power Supply 
Upload Manager 
Wireless Zero Configuration 

U may find more services according to ur requirements!