File Shares, scan security, bypass NAT

I have a small home network consisting of two computers, one running XP and the other 98.  My ISP puts me through a proxy so my true IP is hidden, I want to test the security of my file /printer shares and my network in gernal but all the sites I have found complain about me being on a proxy or NAT server, and refuse to test.  

I want to know if there is any free network scan out there that can bypass the proxy and reveal to me the security of my file shares.

Thank You.
sn1xipelookAsked:
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stevenlewisCommented:
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sn1xipelookAuthor Commented:
the shields up link provided worked, it corectly identified my computer and it had a file shareing scan.  Thank you very much.
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magi43Commented:
We use grc as well, and this is an interesting freebie

http://www.cyberkit.net/
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