How to fix broken taskbar icons in Windows 7

I have a program pinned to the taskbar. After I upgraded the program (I think) the icon broke. What I get now is what you see below; that ugly default application icon thing.

Broken icon

If I unpin it, I get the correct icon. If I then right-click on it, the icon breaks again. If I pin it again, still the broken icon. Unpin again and back to good icon. Very annoying. How can I fix this?

Answer

Based on @dash17291's answer, here is a slightly faster procedure (no reboot) that worked for me:

Open Windows Explorer, go to %userprofile%\AppData\Local, delete IconCache.db.

Open Task Manager, go to Processes tab, highlight explorer.exe, and click End Process. Your desktop will "disappear."

Still in Task Manger, select File > New Task (Run...), type explorer.exe, and click OK. Your desktop should reappear, with the previously missing icons.

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