How to install wifi lan in acer laptop

If the laptop does not have a built-in WiFi, you need to buy an external Wireless Adapter.

There are lots of brands that offers wireless adapters, but you need to check with them about the system requirements of the device. You may select from the following:

Linksys
IOGEAR
Netgear

Check the links below for IOGEAR brand. It offers the GWU523 and GWU623. The GWU623 is the latest with wireless-N technology and the GWU523 is with wireless-G:

For GWU523:

http://iogear.com/product/GWU523/

For GWU623:

http://iogear.com/product/GWU623/

If you have more questions, please let me know. Have a great day!