In order for you to play Tiny and Big: Grandpa's Leftovers on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP
Processor (CPU):
Core 2 Duo / Athlon X2, at least 2 GHz
Memory (RAM):
2 GB RAM
Graphics Card:
ATI Radeon 2400 or better / NVIDIA GeForce 8600 or better
Hard Drive:
1500 MB HD space
Sound:
OpenAL compatible
In order to play Tiny and Big: Grandpa's Leftovers on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
OS *:
Windows 7
Graphics Card:
ATI Radeon 2900 or better / NVIDIA GeForce 8800 or better