Icon went missing in Windows 7? Here's a Fix
After installing the latest and greatest Mozilla Firefox 3.5 in Windows 7 (RC Build 7100 32-bit) I noticed that after a while the icon went missing. Firefox was still working correctly, and when I checked the icon properties, and the icon was still present. But for some strange reason it wouldn’t show up in on my Desktop, my Start Menu, or my Taskbar, I would just see a broken icon.
The resolution? Rebuilding the Windows 7 Icon Cache. Follow these directions: Icon Cache - Rebuild
Your icons should be as good as new!