You can rebuild the icon cache which is under %localappdata%\Microsoft\Windows\Explorer
Please follow these steps.
- Open Command Prompt (CMD) as administrator from the start menu.
- Run
taskkill /F /IM explorer.exe
to stop explorer. - Run
del %localappdata%\Microsoft\Windows\Explorer\iconcache*
to delete the icon cache files. - Run
start explorer.exe
to start explorer and the icon cache should be rebuilt automatically.