Separate names with a comma.
Got it to work the .dll files need to be placed in SysWoW64 folder under system 32.
Windows 7 Enterprise, just copied over adbusbwinapi.dll and still have the same problem.
On step 10.
10. Copy adb.exe (first thing listed) and AdbWinApi.dll to your C:\Windows\System32 folder. Now you can run adb from any directory...