I've got a similiar problem with all version of Intel C++ Composer up to the brandnew Update 2.
I've installed Visual C++ 2010 Professional (German edition) and installed the C++ Composer.
The latter integrated well into VS 2008 and 2005 and didn't show any error regarding its 2010 integration.
But there are no signs of an VS 2010 integration (of course I've checked it during installation process).
When opening the VS 2010 About dialog, it shows Intel Visual Fortran, the Intel Inspector and Intel VTune but no signs of the C++ Composer.
Any ideas for this problem?