Now you probably know that keeping enough memory on your computer is important.2 many things running will REALLY slow it down.
Here is info on the processes running in Windows XP.You can look at what's running in you computer by right clicking the taskbar and choosing task manager.
It's also a file on your hard drive called "taskmgr.exe".
These are some links I found by searching Google.
http://www.answers.com/topic/system-idle-process
http://www.neuber.com/taskmanager/process/alg.exe.html
http://www.neuber.com/taskmanager/process/explorer.exe.html
http://www.neuber.com/taskmanager/process/svchost.exe.html
Also,a lot of memory is used up with services! There is a manager 4 the services.It's in administrative tools.Here is the direct link.
%SystemRoot%\system32\services.msc /s
Here is a program that frees up memory. http://www.snapfiles.com/dlnow/dlnow.dll?Inc=No&ID=102841