An intrusion secure personal computer system includes a central processing unit, a data storage means, a memory means, a primary operating system, a virtual machine operating system providing an isolated secondary operating environment functioning separate from the primary operating system and controlling operations of the personal computer system within the isolated secondary operating environment and at least one input/output (I/O) connection in operative communication with an external data source, where the personal computer system is secured from malicious code contained in a file downloaded from the external data source.