If you have an Acer Aspire One which uses the Broadcom WLAN then this driver is what you need. The driver was released in March 2016 as version 5.60.350.6 fro Windows 7. You can download the driver listed below.
If you are upgrading then you need to uninstall your current driver and reboot and Windows will ask you for the driver. If this is a new install then you can simply click on the file to install the driver for you. Always scan drivers which you download from the internet.