the image file ..... setup.exe in valid,..

Hi All,
I get this error "the image file ..... setup.exe in valid,but for machinetype other than the current machine ..." when I run setup.exe from a database patch download for win 64 bit enterprise edition.
Our server configuation is fully compatible except for that its not Intel Itanium but Intel Xeon which is what the patch "read me" mentions.

Can this be the reason ?
please provide your inputs.

Thanks..
Arshad.