Tool for managing windows services in Windows XP allows you many things, but you can’t unregister (delete, remove) a service with it. There is however a command line tool that allows that.
Remember that unregistering important services may break your system. If you aren’t sure what you’re doing – don’t. You have been warned.
First you need to check real name of the service (not it’s display name). To do this go to Control Panel–>Administrative Tools–>Services, and find the service you want to uninstall. Right click it, and choose “Properties”. Then, on the “General” tab, find “Service Name”. For example for service on the screenshot it’s WLSetupSvc.
Next go to command line and run command ‘sc’, it will enumerate its options. This is the tool, that we’ll use to uninstall the service. To do this type
sc delete SERVICENAME