Undeletable Favicons

Hi All
A while back I posted a request concerning the wrong favicons appearing in IE.
The solution I found out was to delete the offending Favicon in internet options and reload when going back to the site.
However I now have about four or five Favicons that just wont delete from internet options. I have tried to delete them by selecting individually and together and deleting, by deleting all internet files and by telling my anti virus software to delete all internet files. These Favicons always remain.
Could somebody please tell me know how I can delete these favicon files with out taking a hammer to them!!:hammer
Thank very much in advance for any help with this.
Jono Roto