What program do you use to hover that cursor in? If Windows Explorer, maybe the files are hidden. Try the setting to show hidden files.
I wanted to burn a CD for a friend, and went to My Music on my External Hard Drive. When the cursor hovered over the album I wanted to burn, the album properties and content(i.,e. track names) show up, but when I clicked to open, there was nothing at all inside the album file. This was an album I'd ripped using Windows Media Player from a library CD, & I've found the same condition with some(but not all) albums downloaded or ripped via all three music services I use: Rhapsody, iPlayer, and WMP. It's very odd and extremely frustrating. Any ideas on recovering these files would be appreciated