He asked for tweaks to xp???
One I find is goto run and then type in services.msc and follow this
1) Make sure your on windows classic without a wallpaper, then find "themes" open stop the service and then disable..
2) If your not using Automatic updates disable that, along with indexing service, and system restore ( since most bugs hide there that goes bye bye with me )
3) If your the only user disable fast user switching and secondary logon
That is only a few I use and it does make a little difference, if only in ram usage.
Other tweaks is I never use .bmp wallpapers remember it has to load every time you load windows, and if you want to be resource savvy wallpapers and themes - resource loss.
I also use Diskeeper well worth the price for the top version, CCleaner as previously mentioned.
With regard to MSN Messenger, to lower the amount of ram that bloatware users grab the mess patch for your version from
www.mess.be to strip out the adverts and accessories you do not use, with Yahoo Messenger you can swap to classic and close most of the rubbish from it's config menu's.
I also use Foobar for my mp3's since it takes a tiny amount of ram to use far more efficent to Winamp or Windows Media Player 10 OR 11, And I use the Klite Codec Pack from
www.filehippo.com to play videos since it uses MP classic.
All of those programs take less resources so things load quicker.