Let's rebuild the icon cache and see if this resolves the issue.
1) Restart your computer, click on Start to open the Start menu, click on All Programs, then Accessories. You will now see Command Prompt, click on this to open the Elevated Command Prompt. You will see an image like the one below.
2) In the Command Prompt, copy and then paste each of the following commands one at a time and then press Enter after each command.
taskkill /IM explorer.exe /F
DEL "%localappdata%\IconCache.db" /A
shutdown /r /f /t 00 Notice: This command will close Explorer and restart the computer when complete.
3) The IconCache.db should now be rebuilt