The Acer Extensa 4420 comes with 2GB of RAM, and although this is sufficient, it might be a good idea to upgrade to 3GB, since the graphics card borrows up to 640MB of memory, and could bog down the system, especially when running CPU-intensive applications.
The following drivers,software and user manual are compatible with your Acer Extensa 4420 notebook and compatible with Windows Vista and Windows 7 32-bit.
Broadcom Wireless LAN Driver 188.8.131.52 (2.9 MB)
ATI VGA Driver 184.108.40.206 (74.2 MB)
Synaptics Touchpad Driver 220.127.116.11 (10.7 MB)
Foxconn Modem Driver 7.60.00 (2.1 MB)
Marvell LAN Driver 10.12.8.3 (1.9 MB)
Acer FIR Driver 1.0 (89.1 KB)
ABIG Fingerprint Driver 18.104.22.168 (56.0 MB)
O2 Card Reader Driver 22.214.171.124 (1.5 MB)
Suyin Camera Driver 126.96.36.1990 (6.2 MB)
Realtek Audio Driver 188.8.131.5204 (36.7 MB)
Broadcom Bluetooth Driver 184.108.40.20600 (57.0 MB)