You could try to rebuild the icon cache used by windows. The location of the cache file is hidden so you need to unhide it... Open Windows Explorer, click organize, then select Folder and search options > Views tab then select show Hidden files and folders. Next go to the C:\Users\"your user name"\AppData\Local folder and delete the hidden file called IconCache.db and reboot. Windows will rebuild the icon cache.
Go back an rehide the folder when done.