If you're just looking for information on the services then might I suggest this...
http://blkviper.com/WinXP/servicecfg.htm
It's a pretty comprehensive list of default services that are installed in Windows XP. If you can't find something on there (and there were many I couldn't) you can always google them. I found my anti-virus software and some other stuff that way.
You can use that page and your services manager (start---run----services.msc) to figure out what all that junk is and if you don't trust it you can disable it from there as well.
Hope that helps
