Installing Lame on Windows 7 x64
If you want to record MP3′s on Windows 7 you’ll have to install the free Lame MP3 encoder. This can be complicated on Windows 7 x64. Here are few instructions how to install Lame on x64 anyway.

Often the MP3 encoder is also needed to import media files into certain applications like Camtasia Studio. This is also the case when you receive the error message “no codec available to render this file” when you’re importing a MP3 file into Camtasia Studio.
1. Download Lame from sourceforge (latest may 2010: 3.98.4)
2. Extract all files inside the zip archive to C:\lame
3. Open an elevated command prompt
4. Type cd %windir%\SysWOW64 and hit enter
5. Next, type rundll32 setupapi.dll,InstallHinfSection DefaultInstall 0 C:\lame\LameACM.inf to install Lame via the LameACM.inf file.

Lame for Audacity
If you are still receiving the error “no codec available to render this file” when you are importing MP3 files in Camtasia Studio, simply use Audacity to re-save the MP3 file. Install Lame for Audacity and then import the MP3 file and export again as MP3.
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Hey, where is the info file “LameACM.inf” ????????????????????
It’s not in the latest may 2010: 3.98.4-file…
Everything done as you describe
1. typed -> %windir%\SysWOW64 – ok, result -> C:\Windows\SysWOW64>
2. typed -> rundll32 setupapi.dll,InstallHinfSection DefaultInstall 0 C:\lame\LameACM.inf -> result -> window with “installation failed”
Tried 3.99.5, 3.98.4 with same result