Safari will not open any windows

There have recently been many reports of new problems with Safari. It seems that the recent Safari update has issues. Word has it that Apple knows about the problems and is working on a fix. I assume that it will be released fairly soon. In the meantime, use another browser such as Firefox or Chrome and they should work for you. Also, there are reports that reinstalling Safari and restarting the computer has resolved issues. I hope this helps.

I had this problem only when opening Safari and the App Store. Safari opened, but could not navigate any pages. When I opened the App Store, I only could see a blank white box. Turned out that something was causing the SOCKS Proxy setting to turn on. Go to System Preferences > Network> Advanced> Proxies. Mine had a checkbox in SOCKS Proxy. This was the problem. I unchecked it and Safari and App Store would open up fine. When I restarted my Macbook Air, the check mark would reappear.

I saw so many posts on downloading Malwarebytes and running the scan which solved the problem, I decided it was time to give it a try.

I was glad I did, because it did find Adware and after I selected the files and deleted them, everything worked perfectly. Checked the Proxy setting and no more check mark under SOCKS.

I know that you said you had already run the scan and deleted the files, but did you go back into the Proxy setting and uncheck SOCKS Proxy and click apply?