tthe appropriate version of lame for audacity 2.0.5

I have downloaded and successfully installed 2.0.5 on my HP pavilion notebook with quad core amd processor. It is beautiful. My problem is which version of lame is appropriate for this package? I have tried all of the 3.99 versions I could find and one of 4.01. When the requestor box pops up and I browse to the directory where lame_enc.dll is after oking it I get a message saying that it is not compatible. What one is?

Thank You!!!

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