My laptop won't connect to the internet?

[Ellie]

So for over a year my Acer laptop (windows 8) has worked fine with my wireless internet connection, until about a week ago when this tiny yellow triangle appeared over the connection. My laptop shows my network, and the internet works on every other electrical device in the house.

I have tried cmd in run and found that my laptop is sending details to the network adapter fine but is not receiving them back.

I have double checked my internet is defiantly switched on.

Even sometimes when I click on the internet and it says 'connected' (but still has the triangle) it comes up with 'This page can't be displayed'

Please help me!