Login problem!

Hi to everybody!
first sorry for my English!
This is my problem!
From more than one year I have installed a webblog in my Italian page http://www.per-il-mondo.it/blog/
Suddenly, without a reasonable motive (no updatings and no changes) I cannot make the login anymore and enter in the admin of the blog!
Firefox tells me, there are problem whit the Redirect, that it can never be completed. cookies problems .
But it isn’t!!!!!

Internet Explorer jams entirely!
The problem there is already from a week. The blog is visualized well however. The problem is “only” that I cannot administer it!
Someone can help me!?!!?!!! Please!

Lucia