Here’s how to go about rebuilding your Windows Vista Icon Cache:
1、Make sure you have Command Prompt and Task Manager open.
2、Kill Explorer (use theTask Manager to do this)
3、Open the command prompt and go to: %USERPROFILE%\AppData\Local
4、Unhide the IconCache.db file with the following command: attrib -h IconCache.db
5、Delete the IconCache.db file: del IconCache.db
6、Start Explorer (or restart your computer)