The whole point of using my plugin to fix your site is that it can remove the malicious code from your infected files without affecting the good code that is supposed to be there. My plugin would not be so successful and highly rated if it deleted your core files 
The main problem for you is that you cannot access your wp-admin, but your didn’t elaborate on that so I don’t see how I can help you there. Please explain: why are you unable to access your wp-admin?
