Ah.. I see. Unfortunately your system falls significantly below our minimum specifications which is why you're encountering this issue. For clarification I'll post the specifications listed at the bottom of our store page:
MINIMUM:
Requires a 64-bit processor and operating system
OS: Windows 7 64-bit or later (64 Bit ONLY)
Processor: Quad-core Intel or AMD processor, 2.5 GHz or faster.
Memory: 6 GB RAM
Graphics: NVIDIA GeForce GTX 760 or AMD Radeon R9 280X series card or higher.
DirectX: Version 10
Network: Broadband Internet connection
Storage: 100 GB available space
Additional Notes: This game needs a dedicated graphics card to run. It will struggle to run on laptops, notebooks etc.
I'm not sure how many hours you have in the game, but if it's two hours or under you can request a refund from Steam themselves here: https://support.steampowered.com/kb_article.php?ref=6695-QIKM-7966