unless you really know the .msc file system I would not mess with it bro. Try... damn been a while since I used XP... 1st what do you want to change?
2nd to modify startup items more cautiously, go to the startup menu... I think its \documents and settings\(username)\start menu\startup if you go there you will see all the shortcuts for all programs that load everytime windows boots. Dont forget the all useful right click - if you dont know what the hell some icon relates to vis'a'vee (no, I didnt take french) the application, right click the icon and choose properties, and then "find target"
That gnarly services.msc window shows active apps even when you arent logged in (why? example: so your web server continues to function when the welcome screen is shown.
The default choices for what loads and runs is pre-decided by microsoft, you can see whats what in the startup type column. You can really mess things up by double clicking any of these services and choosing to alter its default status from Automatic to Manual or disable it. If you dont know exactly what they do, and *more importantly* how they inter-relate (ie you may think disabling one would be cool, but it may be one that must automatically start in order for another one to function, and effectively hose your applications at a level only more ass-annoyingly possible by going to the Registry and trying to play God there. Dont, really do not, turn the preconfigured load status of these buggers unless you are SURE you know the ramifications, and ALWAYS take a pen, and pad of paper, and write down WHERE you went (registry, or services.msc or whatever, and WHEN you fucked with it, and WHAT you changed. Hopefully you will be able to boot your PC in safe mode and un-fuck it when you realize that this nifty ability is sort of hidden for a reason, that being most people dont need to alter them, and most people cannot figure out the way to fix their mistakes once they reach a point of really being noticable. Especially if you like to dork around with this stuff late at night, after a few beers and bong hits. Thats a recipe for a costly geek-fix unless you have a cool backup like RAID 0+1 or a tape backup or something, and really know your way around the f8 load to safe mode, etc. I recall trying to help you *?* when I was new here - oh so long ago

with some startup issue? Was that you?
Anyways, use the Start and Stop buttons on the toolbar of the services window to do either.
WIN.INI files. if you see something like LOAD= or RUN= with a program reference... well we can burn that bridge when we come to it.
Task Manager, when used in ignorance to alter the status of a load app can really, repeat really hose things - again, down to the registry. If you do not know what a startup app does, create a Registry patch of the WHOLE Registry Key in question. If you dont know this means, do not proceed.
I hope this helped. Its been a while, and I am no windows expert, but I think I covered the basics for the questions you asked. Btw, if its the svchost.exe or the services.exe you are thinking about removing from startup, realize that these are the programs responsible for launching processes operating behind the scenes, those very ones controlled by services.msc Under NO CIRCUMSTANCES should you interfere with svchost or you can bring your windows box to its knees.
Buy a Mac
Goo_ru