1. A printer control system comprising: at least one hardware processor is configured to implement: a snapshot creating unit that creates at least one or more snapshots each having recorded therein a state of a virtual machine, the state including a printer control program that operates on a guest operating system installed on the virtual machine; a snapshot managing unit that stores a snapshot created after the printer control program is installed and initialized in a snapshot storing unit, as a reference snapshot among the one or more snapshots created by the snapshot creating unit, and manages the reference snapshot; and a program executing unit that requests the snapshot managing unit to cause the virtual machine to read the reference snapshot, and executes the printer control program when an execution request for the printer control program is received for processing of a print job.