Free or very cheap Internet content blocker?

We have a single kiosk computer type of deal at our business, meant for public access...of course if you leave it open people will abuse it and found someone looking at explicit sites on it.

Because it's only a single computer, is there any preferably free content blockers I can throw on it to avoid this issue?

Thank you in advanced.
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Pancake_EffectAuthor Commented:
Perfect! I gave OpenDNS a go and it's working great. I use OpenDNS as a DNS provider all the time, had no idea they did content filtering. Thank you.
Great. You gave your selection a spin and are happy with it. :-)
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