Acer extensa 5220 Wlan/Wireless/lan XP Driver - Problem Solved

Wireless/Lan Fro Acer Extensa 5220 Driver
Wireless_BCM4312_v4.170.25.12_XP_x32
Download zip-file at
http://support.acer-euro.com/...
Download

Use the silent-install.

Hope It helps.