For Windows XP:
Open the problematic folder, Press and hold SHIFT key, right-click in empty area and select "View -> Thumbnails". It'll toggle the file/folder names.
Actually its a feature to show/hide file names while in Thumbnails mode.
For Windows Vista and 7:
Open the problematic folder, right-click in empty area and de-select "View -> Hide File names". If the option is not available, then press and hold SHIFT key, right-click in empty area and select "View -> Medium Icons".
To Restore as before, Again do the Same process...
