Acer doesn't officially provide hardware driver for Windows XP for Aspire 4738Z. Here its links to download that drivers I found on net.
1. Chipet:
Intel Chipset Installation utility + Drivers
Download
Intel Turbo Boost
Download
Intel AHCI Driver
Download
2. Lauch Manager Dritek
version: 2.0.02
Download
3. Graphic:
ATI Mobility Radeon HD 5470
see related hardware ID here
Download
Intel(R) HD Graphics
version：08/18/2010,6.14.10.5294
Download
5. Audio:
Realtek High definition Audio Driver
Realtek ALC272 @ Intel Ibex Peak PCH
version: 6.0.1.6171
Download
6. Touchpad:
Synaptics PS/2 TouchPad Driver
version: 15.0.18.0
Download
7. WIRELESS:
Broadcom BCM43225 802.11b/g/n Wireless Network Adapter
version: 5.60.48.35
Download
if still cant install, get the hardware ID for the device with yellow and mail me the hardware ID
8. LAN/Ethernet:
Broadcom NetLink (TM) Gigabit Ethernet
Download
9. Card Reader:
Alcor Micro USB Card Reader
version: 1.0.10.48
Download
10. Webcam:
Chicony webcam Driver
Download
Suyin Webcam Driver
Download