Can not detect wireless network on wifi enabled

Make sure on laptop wi fi switch is turn on.
Uninstall wi fi network adapter driver then reinstall.
Right click on my network places and click on property then right click on wi fi adapter and enable it and click on view available wi fi networks .
If you still not detect signal of router then You hav to reset router.
For thjat press RESET button for 10 seconds it is in back panel of router.Then it defaults.
then connect router to computer with ethernet cable then you can access it with below link.
http://192.168.1.1
or
http://192.168.0.1
type user as "admin" and password as "admin" or blank or "password"
Then you can see configuration page.
Then set WAN settings as your isp.
GO to wireless settings and enable it .
If you want to secure enable WEP security and add wep code.
Enable DHCP.
Then save and restart router then check.
Let me know if you need further assistance.
Thanks.