Very late to the party but I know how to resolve your issues with windows missing without doing reinstalls...
- Close BSPlayer if open
- Go to BSPlayer folder
- Go into the folder "insfiles"
- Open the file "BSPlayer.xml" with notepad
- Find the lines...
<PlayWinPos type ="int">###</PlayWinPos>
...for the video window...
<MainWinPos type="int">###</MainWinPos>
...for the main window.
In both cases the ### number is the location of the window in terms of on-screen pixels (I assume). So if you replace the number with say "1", then save the file, when you open BSPlayer the window should have moved.
(You'll likely need admin access to the folder if it won't let you save.)