Im not sure whats going on here.  We have about 8 computers here and im running the same bat file to register the dll.  So far 2 computers registered fine while 3 of them have the wrong dll shown when you mouse-over the addin under "Add-Ins" menu. 

The wrong dll is C:\\Program Files\\SolidWorks 2009\\sldautotraceu.dll .  

The bat file I am running to register the dll is

ECHO OFF
:start
TASKLIST|find "SLDWORKS.exe"
 
IF %ERRORLEVEL%==0 GOTO Close
 
Goto Install
 
:Close
Cls
Echo Please close SolidWorks.  It may take up to 10 seconds to fully close.
Pause
Goto Start
 
:Install
CLS
ECHO OFF
C:\\WINDOWS\\Microsoft.NET\\Framework\\v2.0.50727\\RegAsm.exe "V:\\SolidWorks\\Addins\\AddinName\\AddinName.dll" /codebase
 
 
CLS
 
ECHO AddinName has been installed.
ECHO See the AddinName pull-down menu in SolidWorks.
PAUSE