"shelliconcache" is a file in your c

windows\ directory... Hidden, of course. You'll need to enable the viewing of hidden files to see it. Delete it, that should force Windows to regenerate all icons from scratch. Be sure to have removed the bookmark first!
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"Okay, so I'm not "SANE" so to speak, but uh... I'm the lovable kind of psycho"
http://solareclipse.net/