judicative

I am getting a DNS error when I try to go to a web site. ;( I can go to every other site out there.( I like, I haven't really tried all of them ) The site I want to go to just updated or got a new site or something. I am just wondering how I can fix this DNS error. The web site is staples.ca I was able to go there on Sunday when they launched their new site but the past two days I keep getting this error. Any help would be great. Thanks S.