My computer hasn't been able to connect to the internet for 3 days. I have two other computers and a video game system that connected to the same router and they work fine. The computer that doesn't work says it's connected when I check my network settings and when I mouse over the network tab on my desktop. Sometimes I can even get to msn.com, but no other websites, and no other applications installed on my computer can access the internet. Does anyone know what I should do?