http://vincenzoriccio.altervista.org was checked, and found to have a valid favicon and a link tag.

Notes:
This page has a valid favicon and a favicon link tag. However, it is using the more recent version of the link tag (<link rel="icon" ...>. Older versions of browsers, including Internet Explorer 5 and 6, may not be able to understand it. For best results, consider adding the older version of the link tag as well (<link rel="shortcut icon" ...>.

It appears that none of the favicons are 16*16 pixels in size. In most cases, favicons are displayed at 16*16 pixels. Although browsers can resize favicons as necessary, the resized version may not look as good as the original favicon. For best results, include a 16*16 version as well in favicon.ico if possible. The favicon generated by FavIcon from Pics already includes both 16*16 and 32*32 versions.