Page cannot be displayed

I’ve just installed WP for the first time, everything went pretty smooth except for the login phase. It created the DB and tables alright (checked with PHPMyAdmin as well) but after I login I get a “page cannot be displayed” error.

Now to the strange thing, if I access the blog it looks alright, it also has the “Site Admin” and “Logout” links showing which means I’m logged in. I can also access the dashboard.

When I try to post (and/or delete the comment posted by default) I get the same error when actually confirming the post or delete. HOWEVER; as with the login stuff the post is actually posted and the comment actually deleted.

Help deeply appreciated.