SystemSecurity recently had the virus, and after removing it, I can not use Firefox or IE .. Help?

So I removed the virus from the system's security with "Malwarebytes Anti-Malware. But after removing it, I can not use Firefox or Internet Explorer due to a" proxy error "It says" Proxy Server Connection refused "I am currently in Apple's Safari, but I want to be able to use firefox .. how I can change this? Also used Windows Defender Scan your computer for other infected files or viruses.

Security System is a rogue (fake) anti-malware application. To remove the program that will need to download, install and update the best anti spyware. Below are instructions on how to remove system security. They are very simple and easy to follow. You can download (from the link below) and save to your desktop. <- Http: / / trojan-horse-remover.com

How to Configure IE with a Proxy Server