Not getting rooted again! topic

So I was rooted and I ran a security program just checking viruses and I saw a virus thing called Android exploit root.. So I searched up Android Exploit Root but nothing came up except how to root and other stuff so I just deleted the things that the virus scanner said there were two a system root app and a data file I don't actually know .. but it couldn't be deleted so I installed a system app uninstaller and uninstalled the system app which was called Kinguser and after that I restarted my phone and root was gone I tried to re root but nope it fails :( I kept on trying but nope.. well I searched up how to unroot and I was supposed to deleted the su file in system/xbin or system/bin but I didn't do that first now I'm stuck... Also I tried to install a stock firmware but I couldn't find any for my phone. My Phone is Galaxy Core Advance! HELP I NEED TO ROOT AGAIN!:D