After you install IIS on a 64 bit Windows operating system and you go for BizTalk Server 2006 setup, you may get the following error:
IIS is not 32-bit enabled.
Reason is that If you are using Internet Information Services (IIS) 6 in a 64-bit environment, you must set IIS to 32-bit mode to run the BAM portal. In my case, I was having Windows 7 64-bit OS and BizTalk Server 2006 Developer Edition x86 version.
Solution is very simple. Run the following command on shell and you are done.
cscript.exe C:\Inetpub\AdminScripts\adsutil.vbs set W3SVC/AppPools/Enable32BitAppOnWin64 1