What does it mean when your web browser cannot connect to the internet?

[Shakeel]

Whenever I load up a web browser like firefox or chrome it takes a while for the browser to load up (mostly for firefox) and when it does finally load up it can't connect to my network connection. What I mean is that my computer is connected to my wifi but browsers cannot load up and connect website it just keeps on saying connected to google but never loads up. I am able to get it to work at times but the moment I turn off my computer or if I close the browser it takes forever for me to get working again. If anyone knows whats happening please tell me.
The network that I am using is my home network this problem is only happening to my laptop not my sister's or anyone else's

[Sherman]

For some reason, your computer's wireless card isn't allowing your computer to access the Internet. Either you have settings on your PC that aren't set correctly or your wireless card is no longer working. You may also have inadvertently disconnected the wireless card by sliding the little off/on switch in the wrong direction. I would check that first.