One computer on network isn't allowed to several websites, please help!

Hi first of all thanks for taking time to read this. My problem started a couple days ago when the internet wasn't working right. He took out the NIC card and put it back in. We have 2 computers networked together on DSL. Everything had worked fine until then. Since he changed stuff around I am unable to go to several websites that I usually frequent, such as ESPN.com and it lets me go to yahoo games, but when I click a game it won't open. These problems are occuring on several websites. Someone please help me with what the problem might be because we can't figure it out. Thanks

~Brandon

 

Already answered on your other link, you should not start more then one link at a time.