How to remove KINGroot?

I installed KINGroot and regretted it. Now I can't remove all of its files because of permissions only KINGroot has. My friend tried to remove it by using towelroot and other methods but my phone crashes them. I need a PC method to remove all KINGroot files but also having my phone permanently rooted. The friend I mentioned and my other friend have rooted phones without KINGroot. Can you please help me solve this issue. I have: - Samsung Galaxy S3 mini - model number: GT - I8190 - version 4.1.2 - Phone manufacturing date: Jul 28 2013 If you require any other information about my phone please let me know. I messed up.