SCCM collection for Windows 7 Computers with 64 Bit OS

Create New SCCM collection and paste the below query into it.

select SMS_R_System.ResourceId, SMS_R_System.ResourceType, SMS_R_System.Name, SMS_R_System.SMSUniqueIdentifier, SMS_R_System.ResourceDomainORWorkgroup, SMS_R_System.Client from  SMS_R_System inner join SMS_G_System_OPERATING_SYSTEM on SMS_G_System_OPERATING_SYSTEM.ResourceID = SMS_R_System.ResourceId inner join SMS_G_System_COMPUTER_SYSTEM on SMS_G_System_COMPUTER_SYSTEM.ResourceId = SMS_R_System.ResourceId where SMS_G_System_OPERATING_SYSTEM.Caption like "Microsoft Windows 7%" and SMS_G_System_COMPUTER_SYSTEM.SystemType = "x64-based PC"

Also need report :look at here http://myitforum.com/cs2/blogs/skissinger/archive/2009/06/23/32bit-vs-64bit-report.aspx