Right here you go. I use XP Pro, but if I remember correctly it is the same on XP Home.
Right-click My Computer, and select 'Manage'. In the left-hand side pane, click the plus sign next to Services and Applications. Click 'Services'. Check all the services listed in the right hand side pane. Look at the ones which say 'Started' in the Status column. You will have to look each of these services up on MSDN (
http://msdn.microsoft.com). I'm sorry I don't have time to do it for you. Then when you have looked up the service and checked whether it is safe to disable, right click on the service and select Properties. Go to the Log On tab, and click the Disable button near the bottom. Then close the window.
Also remember to remove absolutely everything from the Startup folder in your start menu.
Please do tell me if this works - I would like to know. I hope this has solved your problem. If it has not, get back to me and I will research it further for you.
Jonathan