The best way to install windows 7 on this machine is by upgrading from windows Vista to Windows 7 because you will find that all drivers installed automatically.
If you make a clean installation into Windows 7, there are 2 drivers which not automatically installed which is Card Reader and Touchpad.
Synaptic Touchpad Drivers: (32/64-bit)
Latest from Synaptic : Download
Windows 7 drivers from Acer : Download
Alternatively you can install Windows Vista Touchpad driver in compatibility mode.
ENE Card Reader Driver
Just download your original Windows Vista Drivers :
1. Extract the driver file, open device manager. For this tutorial just extract
2. Now you will have 3 PCI devices marked with yellow, right lcik on it and select update drivers.
3. Select Browse automatically for driver software.
4. Click browse and tick include subfolder. Now select te extracted driver file and continue to press Next untill Installation finish.
Repeat this step for each PCI devices.
(if you are a non-tech-savvy, here is installation example guided with pictures)
Download Your original Windows Vista Drivers: Download
Extarct the files, look for setup and set the compatibility into windows Vista to install (tutorial with pictures here).
Windows 7 will automatically install the rest of the drivers, here is some information about your devices:
Graphic: ATI Radeon Xpress 1100
Ethernet: Realtek 8139/810x Fast Ethernet Latest Drivers
Wireless : Broadcom Wireless Drivers (ID: 4318) or Atheros AR5005G (2 variant)
Audio : Realtek High Definition Audio
Modem: HDA CX11254 Soft Modem
For audio and Ethernet you can visit realtek website to get the latest driver for your windows 7.