Q: how can i clear a virus on a mac pro

First, you don't have a virus. There are no viruses that can attack Mac.OS X. So, anti-virus programs are selling a cure for a disease that doesn't exist. And they are renowned for borking Mac systems. Please download and run EtreCheck, created by one of own helpers here in ASC. It is a diagnostic tool that's very useful to us in finding problems. Also it will give us further specs on your Mac. After it runs post the log file here. It will contain no personal information.

A Mac can pick up malware but not if you just use common sense. You really have to actively invite some malware in for it to happen. That means downloading and knowingly giving your password for it to download. Mac provides all the protection you need with SIP (System Integrity Protection).I About System Integrity Protection on your Mac - Apple Support

If you do happen to download adware you can use MalwareBytes to get rid of it. Malwarebytes was developed by one of our own colleagues here in ASC. It gets rave reviews and is about the most proven anti-malware software for Mac. If you use torrents, don't. Torrents are a good way to pick up malware because anything can hitchhike in on a download.

Safari pop-ups are different and easier to deal with. In Safari 9.1 and later just close the window. For earlier versions force quit and hold the shift key while restarting Safari.

https://support.apple.com/en-us/HT203987

Finally, stay away from programs that purport to "clean your Mac". They can do damage to your system. Your Mac needs no cleaning in the first place. All the cleaning that is necessary is taken care routinely by OS X.

Usually when people ask a question such as yours, it's because they saw a popup message on some website that said they have a "virus," or that something else is wrong with their computer. The message is a scam. No website could detect that you had a "virus," even if you did have one.

Please quit the web browser. Force quit if necessary.

Relaunch it by holding down the shift key and clicking its icon. That action will prevent the last window state from being reloaded.

Most importantly, never use any kind of "anti-virus" or "anti-malware" software on a Mac. That's how you cause problems, not how you solve them.

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Never take the advice of a stranger on the internet. MalwareBytes is used by Apple Geniuses at Apple Store Genius Bars, and by Apple Telephone Support agents. Please search the recommendations for malwarebytes here in Apple Support Discussions and decide for yourself.

Please explain the reason for your question.

If you encountered a web page alleging the existence of a "virus" on your Mac, it's a scam. For a description please read Phony "tech support" / "ransomware" popups and web pages. If that describes what you experienced no other action is necessary or justified. Downloading and installing something in response to such scam messages would be the first step in a well-worn path to misery.

macjack wrote:

 

Never take the advice of a stranger on the internet. MalwareBytes is used by Apple Geniuses at Apple Store Genius Bars, and by Apple Telephone Support agents. Please search the recommendations for malwarebytes here in Apple Support Discussions and decide for yourself.

I have nothing against MalwareBytes and have recommended it myself. However, whether anyone from Apple ever recommended it is anecdotal. Even if any had, I have had many an Apple employee suggest completely erroneous or irrelevant information so that doesn't seem to be a great argument.