--- libs\thread\src\win32\thread.cpp	2012-06-16 17:10:08.000000000 +0100
+++ libs\thread\src\win32\thread.cpp	2012-07-04 12:31:14.000000000 +0100
@@ -218,13 +218,13 @@
         ResumeThread(thread_info->thread_handle);
     }

     void thread::start_thread(const attributes& attr)
     {
       //uintptr_t const new_thread=_beginthreadex(attr.get_security(),attr.get_stack_size(),&thread_start_function,thread_info.get(),CREATE_SUSPENDED,&thread_info->id);
-      uintptr_t const new_thread=_beginthreadex(0,attr.get_stack_size(),&thread_start_function,thread_info.get(),CREATE_SUSPENDED,&thread_info->id);
+      uintptr_t const new_thread=_beginthreadex(0,static_cast<unsigned int>(attr.get_stack_size()),&thread_start_function,thread_info.get(),CREATE_SUSPENDED,&thread_info->id);
       if(!new_thread)
       {
           boost::throw_exception(thread_resource_error());
       }
       intrusive_ptr_add_ref(thread_info.get());
       thread_info->thread_handle=(detail::win32::handle)(new_thread);