System Idle Process
In Windows NT-based operating systems, the System Idle Process is the system idle task: it measures how much idle capacity the CPU has at any given time. The process runs in the background and constantly monitors processing bandwidth, occupied memory and the Windows virtual paging file. System users can find it in the Windows Task Manager, under "SYSTEM"; however, it cannot be terminated.
Several spyware removal tools have been known to target the System Idle Process, likening its stagnant but watchful properties to what is popularly known as "spyware". Although there is no program file to be removed, some such programs will block it from starting up with the system, causing an " RPC stack error". The problem is rare and most companies have released newer versions that correct the problem.