Can't update my chipset

Hello....

I have a Dell Dimension 4600 and i want to update my chipset driver but it wont work.

The chipset that's in my Dell is a Intel pentium 4 cpu 3.00 GHZ. (Intel 865 chipset family according to Intel Chipset Identification Utility).
When i look at the drivers from the dell.support site, there is only 1 driver there. Chip Set: Intel Chipset Software Installation Utility, Driver, Windows 2000, Windows XP, Multi Language, Multi System, v.5.00.1012, A13  Version 5.1.2600.0 when i look at the device manager because i am using this one at the moment but it's from 16/05/2003
When i look at the the website of Intel i find a newer driver.  Intel® 865G Chipset Version INF Update Utility [INFINST.EXE] (1518KB) 6.0.1.1002  5/7/2004

The problem is, when i run this driver it installs the new driver but when i afterworths look at the device manager nothing is changed. It is still version 5.1.2600.0

Do i need to deinstall the old driver first? If yes, how do i do this?
What i also do not understand is why there are 2 cpu's shown in the device manager. When i click at cpu he shows 2 times a Intel pentium 4 CPU 3.00 GHZ?

Can anybody help me...?