Finder will not work, cannot open files - 10.9.5

Hello

I am a very basic level user and am overwhelmed by all the information. on the net so I hope someone can point me in the right direction:

I use a macbook pro 2010, 10.9.5.  Since yesterday, I can't use the finder. It keeps freezing and not to show all files. In addition, the window often "mosaics" finder up. My first concern was that it could be quite a virus - I used Avast free antivirus that after verification has shown that my mac was no longer protected. So I installed McAfee 30 day free trial of LiveSafe. He has conducted an audit of my computer (and came with 15 threats that are now quarantined). But the mac deteriorate to freezing. I tried to connect under a different name and everything seemed to work OK, included finder. But this test user has not any files or anything in it so I don't know about you.

My next step was to back up everything on my external hard drive I usually once a month.

Now, I think trying to reinstall the osx... it is the right thing to do? And I have a few questions about this:

1. I've got Snow Leopard reinstall disks. I'll be able to install Snow Leopard and then get the Mavericks again?

2 can I completely erase the computer and reinstall. Or is it fine to reinstall on the existing OSX and then you spend? I read that you can do this and not lose any data.

3. If I completely wipe everything and reinstall if the problem is a virus will be he transferred to the computer with the saved data (external hard drive)

Or should I do something totally different? I would be very grateful for some advice. As I said, there is so much information on the internet that I don't know what info to follow.

Thank you very much

Get rid of Avast. It's a waste of time and money.

You have Google installed Player?

Tags: Mac OS & System Software

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