networking internet browser

My internet connection is connected just fine and my signal strenght is good but when i try to search the web no pages will load up it keeps sayin ''internet explorer cannot display webpage'' before then it was working perfect and all of a sudden this happens so can anyone help or let me know what may be the problem please thanks.

 

Please verify: You have good signal to your Wireless Router, but every so often, your Internet stops working, but it still shows your connected to the Wireless?

Did you happen to make any equipment changes in your home at the time that this problem started to occur?

Hope this helps...