Hidden system folders visible

Hello,
I'm facing with sth strange here,and as always it's annoying.it's sth that makes the hidden system folders visible,I go to my external hard and the system folders show up and it really bothers me cuz I'm really neat in keeping my music archive in discipline and well organized,but now...
I customize my folders,change their thumbnails,but it goes back to the first shape again.my antivirus,Baidu,doesn't detect anything.what shall I do people?
any cool solution is well appreciated
rock on