Connection Reset

I have installed WordPress 3.03 on my site via Fantastico. When attempting to update to 3.04, it gets stuck on “Unpacking the update…” for a lengthy amount of time, which is fine. But, after a while, firefox tells me:

The connection was reset

The connection to the server was reset while the page was loading.

    *   The site could be temporarily unavailable or too busy. Try again in a few
          moments.

    *   If you are unable to load any pages, check your computer's network
          connection.

    *   If your computer or network is protected by a firewall or proxy, make sure
          that Firefox is permitted to access the Web.

I am willing to give more information should it be needed.