virus or malware on IMAC.  There is a 'new user' I can't get rid of.

HI - while browsing the internet, I picked up a virus or malware or something on my IMAC.  The popup msg wanted to send a notice to Apple and I think he wanted to test.  I tried to click out of it, but it wouldn't disappear.  I clicked on safari, but then, he wouldn't let me go on the internet.  I shut down the computer and signed on, I tried to go to the Activity Monitor and see that there is another 'user '.  I try to delete and force leave him, but he won't let me.

I have an imac OS X 10.10.2.

I'd appreciate any help, please.

Thank you!!

Toni

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Tags: Mac OS & System Software

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