Asus A8M2N-LA Drivers

I recently purchased an HP Pavillion a1610n Media Center PC. I immediately upgraded the OS to XP Pro. Well of course I now need to install numerous drivers to te everyhting back in working order... Went to HP Website and did search under item name and only 2 XP drivers available. Called HP Support and they informed me that they do not support OS upgrades and there are no drivers available for XP OS. Ok... so I went to ASUSTek... Searched my MOBO Serial Number (see question title) and the close as I could get was the M2N mobo. Downloaded as many drivers as they had and got a few items working. Went to NVIDIA (the chipset) and downloaded a couple more compatible drivers... Now I am left with no sound, no modem (not vital) and no working network card (even though the adapter shows up as OK in device manager) The device manager lists 3 items under "OTHER DEVICES" as missing they are as follows:

Other PCI Bridge Device
PCI Simple Communications Controller (likely the modem)
Unknown Device

Does anyone know how to get my sound and network hardware to work? I am worn out...

Here are the specs HP lists for this MOBO:

Motherboard description  Motherboard manufacturer's name: ASUS A8M2N-LA
HP/Compaq name: NodusM-GL8E
 
CPU/Processor  Socket: AM2
Supports AMD Athlon 64, Athlon 64 X2, and Sempron processors
 
Front-side bus (FSB)  2000 MegaTransfers/second
 
Chipset  GeForce 6150 LE chipset
 
BIOS features  Award brand system BIOS
Keyboard combination to used to enter BIOS: F1
 
Form factor  Micro-ATX: 9.6 in X 9.6 in
 
Memory  Four 240-pin DDR2 DIMM sockets
Supports PC 4200 (533 MHz) and PC2 5300 (667 MHz) DDR2 DIMMs
non-ECC memory only, unbuffered
Maximum HP/Compaq approved memory is 4 GB*
 
Expansion slots  Three PCI
One PCI Express x16 graphics
 
Video graphics  Integrated
 
Serial ATA  4 SATA connectors
Each connector supports 1 serial ATA-150 disk drive
 
Onboard audio  Built-in High Definition 8 channel audio
ALC883 or ALC888 CODEC
Onboard LAN  10/100 Marvell 88EC031
 
Back panel I/0  Listed in physical order from left to right:
One PS/2 keyboard port (purple)
One PS/2 mouse port (green)
One SPDIF (coaxial) out
One S-Video port
One VGA port
One IEEE 1394a
Four USB 2.0
One RJ-45 networking port
Audio ports:
side speaker out (gray)
rear speaker out (black)
center/subwoofer (yellow orange)
line in (light blue)
line out (lime)
microphone (pink)
 
Internal connectors  One 24-pin ATX power connector
One 4-pin ATX power connector
Two PATA connectors
Four SATA connectors
One floppy drive connector
Two 12v fan connectors for CPU fan and PC fan
One 9-pin header for power button, reset button, power LED, and HDD LED
One front line input connector
One 9-pin audio header for headphone-out and microphone-in
One SPDIF output header
One USB 2.0 connectors supporting 4 additional USB 2.0 ports
One IEEE 1394a connector