I had a major problem with “proxy server cannot connect to internet”. I was being prevented from accessing the internet. I tried many fixes but non worked. Finally I found a suggestion to try Zemana malware. It solved the problem. It detected and deleted malware that my bit defender could not. So now I have to decide if I should use both tools together. So should I use both Zemana and Bitdefender together, if not then which one is preferred.