Re: [Boost-users] [BOOST THREAD] Threads Spawning Unexpectedly

That may be part of your problem.  Assuming that you are using Visual Studio, go to the project properties dialog.  In the tree at the left, select Configuration Properties - C/C++ - Code Generation.  About halfway down the list on the right, you will see a "Runtime Library" property.  Set it to the correct value for your program.  The choice should be obvious.

Single-threaded CRT is available in MSVC7 and below, so if the OP uses more modern version, invalid CRT threading choice should not be a problem.