Roger, The link below should be of some help.
I received a forwarded email with attached photos. I deleted without opening. It put one .gif icon in the Tray which I also deleted without opening. It has affected all my desktop icons.I ran virus scan with no viruses. All my desktop icons changed appearance. I downloaded TweakUI and ran rebuild/repair icons. It seemed to have worked on some, but other icons are blurred and when I try to change the icons, they are remain blurred. Please help.
O/S: Win XP Pro SP 2