Page won't publish or run code

I have a little problem. When I go into the site builder, the page stops working, and the red info box says OPENING PAGE. HTML code does not run but is viewable as text, the site says that it is published when it really is not, and I cannot delete anything. As this is an organization page, I would HUGELY appreciate if you could fix this ASAP! I run Vista Premium, but have tried with the same results on XP Home, and Ubuntu. Also, this happens in IE, Firefox, Chrome, AND Safari, which is supposed to be "bugless." (not really a little problem :\ ) Please help!