I saw that too. It's a bug in Windows explorer. Researching a little on how to fix it, found that it has been reported to MS numerous times and they do NOT plan to fix it.
The only workaround I know of is installing a program called "Classic shell" (Welcome to Classic Shell
). It adds a lot of options in Windows Explorer to customize and make it similar to WinXP, and even has a complete replacement for the start menu to look like previous versions.
The important part is, it includes an option to fix that bug among its customization options. I'm using it and so far it never annoyed me with that bug anymore.