Cant open a Site up!!!Follow

it HAS to be the ads I think...



So I go to a site on 1 of my 2 comps..and I can't get to that site on 1 of my comps!! my other comp I can go to just fine..but once I go to the site on my other comp it loads then quickly goes to a gateway page that says " Sorry, we couldn't find http://a.tribalfusion.com/f.ad%3fsite.... Here other stuff)....... Here are some related websites:"

and Im like??? never had this prob before and it keeps popping up everytime I go to that site?? is it spyware or what??