Seems everything you are trying is internet based....ie. Internet Explorer, Firefox, Chrome, etc.
Have you tried any of your other programs that don't use the net? Do they also run slow?
Purchasing a new hard rive might not fix your problem....maybe you have a problem with your network card or wireless antenna...
I think you said it was a laptop, so worst case, take it over to Best Buy and let the Geek Squad take a look at it...
Good Luck!
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