How do I remove a Trojan virus

Please read Phony "tech support" / "ransomware" popups and web pages.

The work computer uses AVAST for mac as the anti virus,

It will not work properly as long as "Avast" remains installed. Uninstall it using its uninstaller, which will remove it completely. Do not use any other procedure or utility to remove it.

The presence of viruses which tend to be for Windows computers and won't affect a Mac (unless you run Windows on it), and the message you are seeing, may be unrelated so you have two issues. Use ClamXAV to deal with the Windows things, check https://www.malwarebytes.com/antimalware/mac/ for your computer. Edit: It looks like Malwarebytes requires OSX 10.8 or greater.

Although you should remove any malware found, it is extremely unlikely that any of them caused the pop-up. Rather this is commonly caused by a javascript on the web site you visited, not anything on your computer.

Obviously you should never call such a number as it's a total scam!

so far none of the steps have worked. There is no apple at the top/left, Safari & Sys Preferences shut down immediately, no icons on desktop, no way to trash. No way to get to applications.

The admin. user is fine, the 2ndary user is infected. Tried running clamX on the admin HD, no luck. Will try downloading the Malware app also.

would appreciate any other suggestions. Is it possible to just wipe out the 2ndary user? and just put them in again without wiping out the entire HD?[including the admin]?

thanks

Your issue doesn't appear to be caused by malware. If you don't need any of that account's files, log in with the administrator account, open the Users & Groups pane of System Preferences, and delete it.

(143533)

thanks Niel, but

I did delete the user. I had a guest user that I deleted as well. I rebooted, and put in a new 2ndary user, the same problems occurred, This is something very strange. When you log into the 2ndary, things look fine, then start to get weird fast, the Finder crashes/blinks on/off, same with Safari, Sys Pref. -- all crash immediately, so i can't even open any anti-virus app

but i checked today, there is a Guest User-- which I cannot delete/the '-' sign is greyed out at the bottom[next to the +] is that normal - to have a guest user, and it says it doesn't require a password

hi guys, thanks, but tried all that was listed. I can't even get safari to launch, it immediately quits - as does

Finder, Sys pref... there is no top menu, no HD icon on desktop. I removed all cookies etc on admin & have

warn me when i visit fraud. sites. When i try to force quit - any & all pop up and disappear immediately - so I can't force quit either

I had deleted all other users. rebooted. tried putting in a new 2ndary user -- SAME issues. so far, thank god,

i don't see a problem with the admin user...

Use ClamXav to remove them, or if you know where the files containing them are, delete them in the Finder.

(143434)

force quit safari

restart safari holding down shift key

go to Safari>Preferences

go to privacy

click remove all website data...

go to security

click on warn me when I visit fraudulent sites.