I am using Windows 7 Utlimate x64.

Once a week, or so, when I boot up n the morning and launch Windows Explorer it shows up blank, as the following screen shot show.

Clicking on my Computer doesn't load anything.

Interestingly, I can go the the Address bar at the top and type in a folder name. This brings up that folder's files and subfolders, but as I drill around the tree of folders on the left only shows the immediate folder and not its siblings. There's no plus icon to expand the folder, etc.

My usual "solution" is to reboot, which typically brings everything back to normal, but this is a frustrating remedy. Any idea what's going on and how to fix it? Some Googling turned up this discussion, but the remedy was to uninstall a particular piece of software that I don't have installed (Virtual Clone Drive).

Thanks