I can't buy Pro
 

When I try to buy Pro, I hit submit, my computer thinks for awhile, and then it says a connection failure has occured. I'm sure it has nothing to do with my connection, because it's done this for over a week now, all the while I can go to most other sites. I get this message in a few other places. So I'm thinking it has to do with some kind of setting that won't let me get to that site. Any ideas. I'm tryin to buy the product here, and I can't.