In order for you to play The Elder Scrolls IV: Oblivion Game of the Year Edition on Windows with minimal graphics settings, your computer must meet the following requirements
OS *:
Windows XP, Windows 2000, Windows XP 64-Bit
Processor (CPU):
2 Ghz Intel Pentium 4 or equivalent
Memory (RAM):
512 MB
Graphics Card:
128 MB Direct3D compatible video card and DirectX 9.0 compatible driver
DirectX®:
DirectX 9.0c
Hard Drive:
4.6 GB
Sound:
DirectX 8.1 compatible