Use this tool to format the sd card, in the options set the format type to overwrite and format size adjustment to on. This might help especially when you used the sd card for other things before.
Even if it's a grey area, as soon as you upgrade to W10 you should be completely legal. http://www.pcworld.com/article/2898668/windows-10-will-be-a-free-upgrade-for-software-pirates-too.html
Not to mention they wiped their arses on the AW port for pc, glad I bought the game for half the price from a key reseller but it still wasn't worth it.