[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

Hi,
      I have a build machine with 64 bit Windows 7 and MSoffice 2013 64bit installed on machine. My MSTest project(.NET) have    [DataSource("ExcelDataSource"), TestMethod] defined on a test method. The test runs succefully when i run the test within visual studio 2013 on the same build agent machine. but when i run the build from within teamcity Datasource name not found error pops up. The entry in my test project's app.config is like this

<configSections>
    <section name="microsoft.visualstudio.testtools" type="Microsoft.VisualStudio.TestTools.UnitTesting.TestConfigurationSection, Microsoft.VisualStudio.QualityTools.UnitTestFramework, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
  </configSections>
  <connectionStrings>
    <add name="ExcelConn" connectionString="Dsn=smt;Driver={Microsoft Excel Driver (*.xls,*.xlsx,*.xlsm,*.xlsb)};dbq=G:\TestParams.xls;defaultdir =.; driverid=790;maxbuffersize=2048;pagetimeout=5" providerName="System.Data.Odbc"/>
  </connectionStrings>
  <microsoft.visualstudio.testtools>
    <dataSources>
      <add name="ExcelDataSource" connectionString="ExcelConn" dataTableName="Sheet1$" dataAccessMethod="Sequential"/>
    </dataSources>
  </microsoft.visualstudio.testtools>

I have created smt dsn from C:\Windows\SysWOW64 folder and it is visible in both 32 bit and 64 bit ODBC. using teamcity 9.1.1 version . tried with platfor x86 and x64 in buildsettings with same result.part build log is attched.

Any help would be really appreciated.


Thanks
Sudheesh