cpan> install QtCore4
Reading 'C:\Perl64\cpan\Metadata'
  Database was generated on Sun, 21 Apr 2013 08:41:02 GMT
Running install for module 'QtCore4'
Running make for C/CB/CBUREL/Qt4-0.99.0.tar.bz2

CPAN.pm needs the external program bzip2 in order to handle 'C:\Perl64\cpan\sour
ces\authors\id\C\CB\CBUREL\Qt4-0.99.0.tar.bz2'.
Please install it now and run 'o conf init bzip2' from the
CPAN shell prompt to register it as external program.

cpan> o conf init bzip2 C:\Program Files (x86)\GnuWin32\bin
'C:Program' is not a valid configuration variable