Windows Xp Services that you can Disable

• Alerter
• Distributed Link Tracking Client
• Help and Support - (If you use Windows Help and Support leave this enabled)
• Indexing Service
• IPSEC Services
• Messenger - (Shoot the Messenger and installing SP2 will disable this)
• Portable Media Serial Number
• Remote Registry Service
• Secondary Logon
• SSDP Discovery Service - (Unplug n’ Pray will disable this)
• Telnet
• Upload Manager
• Wireless Zero Configuration - (If you are on a wireless network leave this enabled)

Services that should always be set to Automatic:

• Automatic Updates - (Required by Windows Updates)
• Background Intelligent Transfer Service - (Required by Windows Updates)
• COM+ Event System - (Required by BootVis and other Applications)
• Cryptographic Services - (Required to confirm the signature of Windows system files, Protected Root Services and Key Services)
• DCOM Server Process Launcher - (Required by Disk Defragmenter)
• DHCP Client - (Required for Cable/DSL connections and Routers)
• DNS Client - (Improves Internet Performance)
• Event Log - (Required by Windows and cannot be Stopped)
• Logical Disk Manager - (Required to manage and update your Harddrives)
• Network Connections - (Required by Network Connections)
• Plug and Play - (Required by your System Hardware, Never Disable This!)
• Print Spooler - (Required by Printers)
• Protected Storage - (Required to protected sensitive data and to prevent access by unauthorized services, processes, or users.)
• Remote Procedure Call (RPC) - (Required by Windows, Never Disable This!)
• Security Accounts Manager - (Required to store security information for local user accounts)
• Security Center - (Notifies you of you Firewall and AntiVirus Status)
• Shell Hardware Detection - (Required by the AutoPlay feature)
• System Event Notification - (Required by various Applications)
• System Restore Service - (Required by the System Restore feature)
• Task Scheduler - (Required by the Windows Prefetcher)
• Themes - (Required by the new look of Windows XP)
• Windows Audio - (Required for Sound)
• Windows Management Instrumentation - (Required by Windows, Never Disable This!)

Source : OptimizeXp and OverclockersClub

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