Well your going to need a app called "Unlocker" ,, its the best,, just install it , simple free app, and right click on the old windows folder, then right click go to unlocker and unlock the mofus kill the process,, It will delete now !
If it still won't delete then its because of 3 files ,,, weirdly enough that are flash.osx ,, basically flash stuff ,,, But I don't know yours just might prune all.
Its a neat app. You can use it on other folders that when u try to delete give you the error message ,, cannot be deleted. Because if their not being used in memory they are being used tangled with the OS ,,, soo u unlock it ,, and choose delete ,, and baaaam its gone.
Sweet sweet app,,, But too bad it don't work on 64 ,,,,,
Also worst case scenerio,, Right click the windows folder and click on hidden, then go to folder options and say do not show hidden folders blah blah,,, get back to us,,, I know its bothersome @ timez lolol,,