Provided that you have at least an NVIDIA GeForce 6100 graphics card you can play the game. In terms of game file size, you will need at least 700 MB of free disk space available. An Intel Core Duo T2050 CPU is required at a minimum to run ReignMaker. Whereas, an Intel Core i3-530 is recommended in order to run it. ReignMaker system requirements state that you will need at least 4 GB of RAM. Additionally, the game developers recommend somewhere around 6 GB of RAM in your system.
ReignMaker will run on PC system with Windows XP and upwards. Additionally it has Mac and Linux versions.