Uneeded Windows services that you can turn off:

• AdobeLM Service: Not all computers have this service, still it is useless, just disable it if you have it.
• Alerter: Disable this one if you are not on a network because you will not receive alerts.
• Application Management: Set this to manual.
• Automatic Updates: Disable it if you don't require auto updating and patching of Windows. It is pretty useless if you use auto-patcher by NeoWin to update your Windows OS. Thus, you will save bandwidth.
• ClipBook: Disable this if you are not on a network, since you don’t need to share anything.
• Computer Browser: Disable this too if you are not on a network, as you don't need to browse and monitor connected computers.
• Cryptographic Services: Set this to manual if you are not sure you need it.
• Distributed Transaction Service: Set this to manual.
• DNS Client: Set this to manual if you are not on a network.
• Error Reporting Service: Disable this useless service for reporting errors to Microsoft, because they will hardly even reply to you for any error you get. Also saves lots of bandwidth.
• Fast User Switching Compatibility: Disable it if you have only a single user on your computer, or if you do not use fast user switching feature much. That is, if you completely log-off and then allow other users to use your computer, then you do not need this. Note that this service is completely useless for low memory computers.
• FTP Publishing: Disable this if you do not use FTP.
• Help and Support: Set it to manual or turn it off if you do not use the help feature often. You can turn it on again when you want help.
• HTTP SSL: Set it to manual.
• Human Interface Device Access: Turn it off if you do not use hot-keys or remote systems on your computer; if you use them sometimes, it is better turn it to manual.
• IMAPI CD-Burning COM Service: Set this to manual to save memory and time. Do not turn it off if you have a CD writer or a DVD writer attached to your computer.
• Indexing Service: Turn it off, it uses lots of CPU. If you are an avid searcher, like a maniac, on your computer, leave it on since it will help you. If you know where your files are and do not use search that often, then disable it for your good.
• InstallDriver Table Manager: Disable it, it does no harm in doing so.
• IPSEC Services: Set this to manual.
• Windows Messenger: Disable this if you are not on a network, it uses too much memory and it is a hog. Also, it does no good and sometimes it is likely to become a security threat.
• MS Software Shadow Copy Provider: Set this to manual.
• Net Logon: Disable if you are not on a network.
• NetMeeting Remote Desktop Sharing: Disable this if you do not use Remote Desktop feature; in my opinion, it is a pretty useless feature.
• Network Provisioning Service: Disable this, iti s useless if you are not on a network.
• NT LM Security Support Provider: Disable this, its useless too.
• NVIDIA Display Driver Service: If you do not use the features of nVidia Desktop, this service must be disabled; it is a big hog of memory.
• Office Source Engine: Disable it if you have a MS Office CD handy always, its helpful if your installation goes corrupt.
• Portable Media Serial Number Service: Set it to manual if you connect portable media to your computer, otherwise disable it.
• Print Spooler: Disable it if you don’t have a printer.
• Protected Storage: Disable it if you don’t allow strangers to sit on your encrypted storage computer.
• Remote Desktop Help Session Manager: Disable it if you don’t use Remote Desktop feature for help and support from Microsoft which most probably is a "Yes".
• Remote Procedure Call Locator: Set it to manual.
• Remote Registry: Serious security threat if turned on, disable it no matter what.
• Removable Storage: Disable it if you don’t use removable storage drives, else turn it manual.
• Routing and Remote Access: Set it to manual.
• Secondary Logon: Useless feature for most, disable it or turn it manual.
• Security Accounts Manager: Disable it, it's pretty useless, unless you use NTFS Encryption.
• Security Center: Damn useless and irritating feature. Disable it.
• Server: Set it to manual or disable it if you are not on network.
• Smart Card: Disable it if you don’t use smart cards on your computer.
• SSDP Discovery Service: Disable it of not on network or don’t have UPnP devices on home networks.
• Task Scheduler: Disable it if you don’t schedule tasks like defragmentation, error scans etc… and plan to do it your self instead.
• TCP/IP NetBIOS Helper: Set it to manual if on network, otherwise disable it.
• Telnet: Set it to manual if you use this feature, otherwise disable it, especially if you are home users.
• Terminal Services: Since you aren’t using Remote Desktop etc… disable it for good.
• Uninterrupted Power Supply: Disable it if you don’t have an UPS attached to the serial port of your computer.
• Universal Plug and Play Device Host: Set it to manual.
• User Privilege Service: Set it to manual.
• Volume Shadow Copy: Disable it if you don’t backup using System Restore or Windows Backup.
• Windows Firewall/Internet Connection Sharing (ICS): Disable this if you have another firewall such as Norton or Zone Alarm installed, otherwise let it remain ON for better security.
• Windows Image Acquisition (WIA): If you don’t connect/use a camera/scanner with your computer, disable this service, else set it to manual.
• Windows Media Connect: Disable this if you don’t use things such as an iPod etc… for your Windows Media Player.
• Windows Media Connect (WMC) Helper: Disable this if you disabled the one above or if you don’t need help.
• Windows Time: Disable if not on a synchronized network.
• Wireless Zero Configuration: Disable if not on a wireless network.
• WMI Performance Adapters: Disable it, useless service for basic usage.
• Workstation: Disable if you aren’t on a network. Or simply, if you are a gamer, just shut this one.