Agilent IVI drivers for 34410A multimeter

I'm developing using LabWindows/CVI 2013 SP1.

I downloaded the 32 bit and 64 bit version of the IVI drivers for the Agilent 34410A multimeter from the following Agilent web page:
http://www.home.agilent.com/agilent/software.jspx?ckey=1639470&lc=eng&cc=US&nid=-11143.0.00&id=1639470

The files are:
driver_ivi_matlab_Agilent34410_1_0_25_0_x86.msi
driver_ivi_matlab_Agilent34410_1_0_25_0_x64.msi

I'm developing on Win7 64 bit.  I'm creating 32 bit CVI applications.

Which version of the IVI driver should I install the x86 or the x64?

Thanks,

Kirk