As always, these drivers can be used on any VIA chipset based system
running any Microsoft Windows 32 bit operating system, but they are
recommended especially for systems running WinME, Win2K and WinXP and
using KT4## series, P4X4## series and newer, for example:

K7 chipsets: KT400, KT400A, KT600, KT880, KM400, KN400

K8 chipsets: K8T800, K8T800Pro, K8M800, K8T890, K8T890Pro

P4 chipsets: P4X400, P4X400A, PT800, PT880, PM800, PM880, PT894

Other drivers are recommended for older operating systems and chipsets.

The changes to this driver, compared with the VIA Hyperion 4in1 v4.53
are:

4in1 v4.55 driver will not update the AGP driver if the system is running
WinXP SP2, in line with Microsoft's recommendations concerning AGP
drivers. The IDE Miniport driver is updated to v3.24 under Windows NT4.0
The VIA Machine INF driver(commonly called the ID file) is updated to
2.30, which adds support for the upcoming PT894 and P4M800 chipsets and
the VT8251 South Bridge.

Download VIA 4in1 v4.55 here.