Not sure what your problem would be. I've got Windows 7 x64 build 7100 at home and both Reaper x86 and x64 work perfectly as well as the respective lame_enc.dll's.
I've always wanted to go back any go over the x64 compilation for lame_enc.dll again and make sure I'm doing everything right, maybe get in touch with the LAME project and everything.
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Intel Core i3 3.2Ghz - Asus P7H55-M Pro - 16GB G.Skill DDR3 RAM - Emu 1820M
Windows 7 64bit - Mac OSX 10.6.7
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