HELP! I'm pretty sure I have a virus. everytime I shut down my mac and open it the background changes. the only thing i've downloaded was a software upgrade. I just recently got this mac so have no idea how to fix it. Please somebody help me!!

I have just recently got a Mac, didn't buy an anti virus or anything because the store man said it wasn't necessary.
After two weeks of use this update software notification kept poping up, so I did and now everytime I turn my Mac on the background changes.
I've heard that this is how the Mac viruses start, I'm very new to this please somebody tell me how to fix it!!

There are no viruses for osx.
You are still under warranty.  Call Apple Care. Make sure you get a case number as all repairs have an additional 90 days of warranty. 
#1 - You have 14 days from the date of purchase to return your computer with no questions asked.
#2 - You have 90 days of FREE phone tech support.
#3 - You have the standard one year Apple warranty.
#4 - If you've purchased an AppleCare Protection Plan, your warranty last for 3 years.   You can obtain AppleCare anytime up to the first year of the purchase of your computer.
Take FULL advantage of your warranty.  Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired.

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