In order for you to play Undertale on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP, Vista, 7, 8, or 10
Memory (RAM):
2 GB RAM
Graphics Card:
128MB
Storage:
200 MB available space
In order to play Undertale on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
OS *:
Windows XP, Vista, 7, or 10
Processor (CPU):
2GHz+
Memory (RAM):
3 GB RAM
Graphics Card:
512MB
Storage:
200 MB available space