In order for you to play Game Dev Tycoon on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP SP3
Processor (CPU):
2 GHz dual core
Memory (RAM):
2 GB RAM
Graphics Card:
Hardware Accelerated Graphics with dedicated memory
In order to play Game Dev Tycoon on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
OS *:
Windows 7/8
Memory (RAM):
4 GB RAM
Graphics Card:
Hardware Accelerated Graphics with 1GB memory