I resolved the issue and tried everthing suggested.
Here is the complete ouput error I got after runing bootstrap.bat or \v2\engine\build.bat: C:\boost_1_50_0\tools\build\v2\engine>build.bat \Utilities\Bin\x86";c:\python23\.;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\syst em32\wbem;c:\program files\ati technologies\ati.ace\;c:\program files\microsoft sql server\80\tools\binn\;c:\program files\cvsnt;c:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\TortoiseSVN\bin;C:\Program Files\MySQL\My SQL Server 5.0\bin;C:\Program Files\Microsoft Visual Studio 9.0\VC\bin;C:\WINDOW S\Microsoft.NET\Framework\v3.5\;C:\Program Files\Microsoft Visual Studio 2008 SD K\VisualStudioIntegration\Tools\Sandcastle\ProductionTools\" was unexpected at this time.
Any idea?
It seems that you fixed it incorrectly. Ensure that PATH variable is correct.