Explain something please. If you clean installed your system(meaning, erased your hard drive and reformatted), and you don't have the .wba files to reinstall the old skins, why are you surprised that they aren't available?

Now, if you somehow retained the old skin folders and you installed to the windowblinds folder then, you probably have a windowblind folder within a windowblind folder. Try this, find wbload.exe and copy one of your skin folders to the folder where wbload.exe resides. If this skin then shows in display properties, then you can move all your other skin folders to that folder.

Or, you can download a new wba and execute it. This way you will be sure that windowblinds is functioning properly. If the new one shows in display properties, then, I would suggest trying what I typed in the middle paragraph, and place all the old skin folders in the directory where the new one that you executed was transferred.