I take a backup of my laptop each month has I dont make many changes to it.
I use Acronis True Image to make a full backup. I have restored my laptop from a backup I took 1 month ago and I know 100 percent that I could access the Internet wirelessly back then.
But even after restoring my laptop from this 1 month old backup, I still have the same problem, i.e. I cannot connect to the Internet wirelessly.