Why won't my Mac Air Book(running 10.8.5) suddenly not recognize my USB Flash Drive?

Today I cant see my Flash Drive or Hard drive on my desktop when inserted into USB port. What can I do to see and use them?  This has not been a problem before.

Hi all -
I cannot view my flash drive OR my office server, which I should be able to connect to via VPN. VPN was installed on my Macbook Pro at my office on Friday. It worked fine. Now I bring it home, and I connect using VPN, and it shows that I am connected, yet the server hard drive icon does not appear on my desktop (as it usually did) and I can't see how to access the server at work.
I also cannot view flash drives when I plug them in - they just don't show up.
I had Norton installed; I read online I should disable that. I did this, and no luck. I also have already done all the things suggested on this post and have all the boxes checked, and yet, still cannot use a flash drive or access my work server.
I am stuck? Do I have to bring my Macbook pro in for service? I have NOT upgraded to Mavericks.
Thanks for any help.
I am not that well versed in finding my way around a Mac - so keep any explanations simple, please.
L

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