[Qt-creator] Exited with code -1073741819. SOLVED

[Gib Bogle]

I'm posting my solution in the hope that this will save others the trouble I 
had.  It turns out that if, like me, you have other compilers installed, it may 
be necessary to prevent qmake and/or the Qt build programs from seeing them.  I 
do this by editing the Build Environment thus:

(1) Unset LIBRARY_PATH

(2) Edit PATH so that it includes only the two Qt paths, i.e.
         D:\Qt\2010.02.1\mingw\bin;D:\Qt\2010.02.1\qt\bin;

With these changes all works as expected - i.e. very well. :-)