Qt 4.7.1 on Windows7 (64Bit)

Hi,

I have installed window7 + vs2008 + qt 4.7.1. After installing

1) I ran the vs2008 x64 Croos Tools Command prompt
2) went to c:\qt\4.7.1
3) typed "configure" on the command line and got the following error after a while -

Creating makefiles in src...
Generating Visual Studio project files...
execute: Unknown error
(-nodepend)
(-tp)
(vc)
(-r)
(C:/Qt/4.7.1/projects.pro)
(-o)
(C:/Qt/4.7.1)
Qmake failed, return code -1

Generating Makefiles...
execute: Unknown error
(-r)
(C:/Qt/4.7.1/projects.pro)
(-o)
(C:/Qt/4.7.1)
Qmake failed, return code -1

I am trying to compile Qt on a 64Bit machine. Can somebody please help with this error? Am I doing the right thing?

Thanks,
Caius