Why wont my youtube/google/facebook homepage wont work?

when i try to go on those pages it always gives me a error and i have to refresh it again to make it go into the site like for youtube i cant go onto my homepage at all same thing with Google chrome when i go on it it gives me an 404 error and i always have to retype it again to get on google, also with facebook... show more when i try to go on those pages it always gives me a error and i have to refresh it again to make it go into the site like for youtube i cant go onto my homepage at all same thing with Google chrome when i go on it it gives me an 404 error and i always have to retype it again to get on google, also with facebook how can i fix this?
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