They were already there and somehow or someone got them deleted. Don't know how or why, but they were missing for whatever reason :P
As for the 64bit version, i would suggest upgrading codeblocks to 12.11 (non-MinGW setup), then download the x64 TDM-GCC bundle from here.
Install whenever, you can delete the default minGW that codeblocks has inside its installation folder.
Then, open up the application and go to the menu bar: Settings > Compiler. From there, at the Toolchain Executables tab, change the path to the minGW folder to the new one you installed.
Set the Program Files paths to the following:
In the tab Other Settings far to the right, you might want to set Compiler Logging to Task Description, but it's not too important.
That should be all, you should be ready to go! As a note, this little guide works supposing you already had a codeblocks install its own minGW package (which would preset some stuff). It won't work if your first install was without the minGW, you'll probably get different kind of errors.