You can look up everything in Task Manager's Processes list on
this Answers That Work site.
Once you know what they are, you can decide whether you need them.
It's the most comprehensive list I've found yet I can't find "svxhost" or "syshost." Those are either typos meaning "svchost," which is "Generic Host Process for Win32 Services," a necessary process best left alone (plenty of information about it on the above site) or they represent viruses, several of which masquerade as the legitimate "svchost" service.
To shut down XP's unnecessary services, use the guide on
Black Viper's site to configure them, using the settings in the Safe column.