How can I get rid of udm (adware ?) popups

I am getting udm popup windows in the lower left corner of all safari windows. Adware/malware bad news.I don't see any activity in the Activity Monitor. I see removal info on the web, but it is all for Windows users. Do we have a udm removal solution for Macs, 10.7.5. Lion?

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Clarification Request
Is this just on Safari?

For me I'd be looking at resetting Safari. While I can debate if this is an infection or not, add ons, extensions are ours to control. That said I'm encountering a lot of folk that just want to use a computer without dealing with its issues.

I think in this case I'd reset Safari as noted at

No downloads required.

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Removal guide at link.
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Help is still needed

Thank you, but I had seen this, and found that I was not smart enough to adapt the Windows-oriented solution to my Mac.
For example:
Step 1. Use the Windows 'Uninstall a program'

Step 2. Internet Explorer, Firefox, and Chrome info

Step 3. Download AdwCleaner.

Previously, I have downloaded "helpful stuff" that compounded the problem, so . . . .

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