If God had anything to do with computers and operating systems, I surely think they would cause less problems. Unfortunately it is some guy, named Bill, that is predominating the market.
However, there is - of course - always a "raw" work-around, i.e. (with BSPlayer inactive) go to BSPlayer's installation folder (default C:\Program files\Webteh\BSPlayer) and in the subfolder "skins" rename folder "Base" e.g. xBase and then rename the skin you prefer to "Base.bsz".