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◆[Multi]Grand Theft Auto IV: Here Are GTA IV PC's Recommended System Requirements
http://kotaku.com/5049326/here-are-gta-iv-pcs-recommended-system-requirements
PC版GTAIVの推奨スペックが公開されています。HDDの容量18GBというのはかなりの量ですね

Processor: Dual core processor (Intel Pentium D or better)
RAM: 2GB
Hard Drive: 18GB free hard disk space
Video Card: 512MB Direct3D 10 compatible video card or Direct3D 9 card compatible with Shader
Drive: DVD-ROM dual-layer drive