How to fix my printer setting

Hi All,
I wonder how to fix my printer settings because after I ungraded my Windows XP to Windows 7 and use the same driver for the printer, the option printing into manual duplex is not working properly anymore. It prints 7,5,3,1 or 8,6,4,2 instead of the other way around.
The other option does perfectly. I even tried to set it on MS Word but still no luck. Help me please!
Thank you !
