Macbook pro will not start up after installing anti virus program.

Cannot back up - is there anyway to go back to prior to installation of software (last sunday)? I took this to the apple store yesterday and they told me I must back up my data so I do not lose it but i cannot get it to start up to do so. It started several times yesterday but will not today.
This macbook was purchsed on amazon.com last october in germany and the warranty (per the apple store) started in June when amazon bought this machine from them so nothing is covered. I am a foreign exchange student (from germany) in michigan for the year and really need to get the computer going and am willing to lose my data if I cannot get it to back up.
What steps can I take to either get computer up (is there a "safe" mose like a windows product) or is there anything I can so short of wiping system clean myself?
Please advise and thank you

eww wrote:
Any Windoze user who is not well protected against any viruses that a Mac user could pass on is extremely foolish, and deserves them.
Interesting attitude. Whether they get infected or not is not the point, they will not be very happy to have received it in the first place.
Safe mode will not work. I am not sure what to do from here - can I just wipe out the system and reinstall since I cant get the system to start up in safe OR back up my files??
By "Safe mode will not work" do you mean it crashed in Safe Mode too or do you mean you couldn't get it to go into Safe Mode?
Try pressing Cmd R during boot. This will boot you into Lion Recovery. You might be able to reinstall Lion without affecting your files.
http://support.apple.com/kb/ht1533
You should have your old OS X disk, the one that came with your computer. You can boot from that disk and perhaps copy your files from the hard drive before you try anything else. Recovering files this way is not something I've had to do so I can't give much advice.

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Hi MJTOOTS,
Since you are getting to the login screen, it is booting past the "gray screen" phase, so try the steps in this article, like a Safe Boot.
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http://support.apple.com/kb/ts1417
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OS X Mavericks: Open items automatically when you log in
http://support.apple.com/kb/PH14173
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BF

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OK, then try this:
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Macbook pro will not start up after installing anti virus program.

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