All other laptops and phones are able to connect to the internet wirelessly in my house but my laptop has stopped connecting. I've read it may be the IP address. Please help.

How long has this been happening ?
Have you tried a simple reboot ?
Other than that more information would be useful.

Have you installed a anti virus recently? Might be a firewall.

Go to Control Panel and open "Network and Internet" then "Networkd and Sharing Center".
On left click on "Manage Wireless Networks"
Find your network in the list and remove it.

Try connecting again


Hope this helps
Grant