My wifi works fine but my pc doesn't sometimes help?

I have my modem running to my router and an ethernet cable running to the back of my desktop pc, everything seems to look fine how it is hooked up , but half the time when i am on the internet using firefox and internet explorer it says this page cannot be displayed. I tried a virus scan through trend micro and... show more I have my modem running to my router and an ethernet cable running to the back of my desktop pc, everything seems to look fine how it is hooked up , but half the time when i am on the internet using firefox and internet explorer it says this page cannot be displayed. I tried a virus scan through trend micro and nothing showed up please help me this is very annoying
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