To Manually Rebuild the Icon Cache using the Command Prompt
1. Close and save anything that you are working on. This command will kill explorer and restart the computer when completed.
2. Open the Start Menu, and type cmd in the search box and press enter.
3. In the command prompt, Copy and Paste each command line below exactly as is and press enter after each command.
WARNING: The last command will restart the computer, so be sure to close and save anything that you are working on first.
taskkill /IM explorer.exe /F
CD /d %userprofile%AppDataLocal
DEL IconCache.db /a