Hello peter
Step 01
you can check whether feasibility of enable wi-fi connectivity
[http://Here|https://www.manualowl.com/m/Asus/X54C/Manual/262459] is your notebook manual. see page 42
Step 02
Re install the drivers and check try to connect via Wi-Fi
Step 03
Uninstall last windows update and check ( i have experience in step 03, most of wifi related issue can be solve in vista and win8 uninstalling last windows update ) but keep the system update once your problem solved
Step 04
Change the wifi card