RE:
Desktop clutter? Do you have thousands of destkop clutter? Move it all away.
Uneeded processes running? Hows your sys tray? Thousands of icons? Kill them.
RUN > MSCONFIG > STARTUP
Deselect everything apart from your virus checker and firewall. You dont really need anything else. Serious.
Likewise with processes
RUN > SERVICES.MSC
http://www.theeldergeek.com/services_guide.htm
You can get away with running on around 10-15 processes. Some people take this to the extreme, but around 10-15 retains functionality.
You could also try the following
a) Check for free space on your drive. Too little and it will increase your load time
b) Completely remove your page file, and then create another fixed page file. (This cures any fragmented page file problems you may have)
c) Before you do b, make sure you defrag your drive anyway, ensuring that you have roughly 10% free space, (see a)
Or the killer method
d) Nlite your Windows XP, slimstream, add drivers, and do a fresh install. Then only ever install programs you will use. Dont install demo's, really naff utils, or anything else other than your main programs and any favourite games.
D usually never fails!