We have Comcast internet and everything was fine until recently. I am currently using my father-in-law's PC, and Gmail, Paypal, and Google all work fine. They don't work on my laptop or my husband's. We've reset the router/modem several times and nothing works. So we unplugged the main line outside and it fixed it for two weeks but now it's back to being stupid again. We've tried everything else and nothing seems to work. Any ideas?