The VIA 4-in-1 driver includes four system drivers designed to improve the performance and maintain the stability of systems using VIA chipsets. These four drivers are: VIA Registry (INF) Driver, VIA AGP VxD driver, VIA ATAPI Vendor Support Driver, and VIA PCI IRQ Miniport Driver.
The 4-in-1 driver will automatically detect your operating system and install only what is necessary. Version 4.40 updates VIA chipset driver from v1.50 to v1.60b and VIA AGP driver from v4.10b to v4.20a.
Here's other similar drivers that are different versions or releases for different operating systems: