Saber si se tiene instalado Office 2007

const string ASSEMBLY2007 = "Microsoft.Office.Interop.Excel, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c";

try
{
Assembly s_assemblyExcel = Assembly.Load(ASSEMBLY2007);
return true;
}
catch
{
return false;
}