The Task Manager/Processes list needed applications running for XP to run. The list shows memory and CPU usage. System Idle Process means just that. This will decrease as needed applications command the CPUs' attention.

Go to Help and Support in windows. In search type "Task Manager". Here you will find information about the Task Manager.

These web sites define smss.exe;en-us;263201&sd=tech

If you are not getting this information from the Task Manager but from a third party free Memory Manager, you have pests. For pest removal see,

others will follow with other points,