Driver Issues XP Home

[techallenged]

Hi Folks, long time no see!

I'm having some problems with me old PC.

Basically, any new piece of hardware I install throws up "Cannot Install... ... due to the wizard not finding the necessary software" message.

It's been like this for well over 18 months, but it's not bothered me since the hardware I've wanted to use has been run fine on my 2nd machine (older and slower).

I won't bore you with the details of why I need to use these hardwares on the machine with problems, but I do need to get it sorted!

Anyway, whichever device I've tried to install (internal or external) or update Onboard devices, and, whether using manufacturers drivers or letting XP find it's own drivers I get the "Cannot Install" message.

I don't really want to have to do a fresh install of XP as it will take me ages to re-install all my coveted software!

The specs of my machine are:
Operating System: Microsoft Windows XP Home Edition SP3
Motherboard:
CPU Type: Intel Pentium 4, 3000 MHz (15 x 200)
Motherboard Name: Asus P4S800D (5 PCI, 1 AGP, 1 WiFi, 4 DDR DIMM, LAN)
Motherboard Chipset: SiS 655FX
System Memory: 2048 MB (PC3200 DDR SDRAM)
BIOS Type: AMI (08/22/05)
Display:
Video Adapter: NVIDIA GeForce 6200 (256 MB)
Storage:
SCSI/RAID Controller: SiS 180 RAID Controller
Disk Drive: WDC WD36 0GD-00FLC0 SCSI Disk Device (36 GB, 10000 RPM, SATA)
Disk Drive: WDC WD25 00KS-00MJB0 SCSI Disk Device (232 GB)
Disk Drive: Seagate FreeAgentDesktop USB Device (465 GB, USB)
Optical Drive: HL-DT-ST DVD-RAM GSA-H55L (LG Make)
Input:
Keyboard: Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse: Microsoft PS/2 Mouse
Network:
Network Adapter: D-Link DFE-530TX PCI Fast Ethernet Adapter (rev.C)
Network Adapter: SiS 900-Based PCI Fast Ethernet Adapter

Many thanks in advance