I found an answer.. 64 bit version of Microsoft Office does not support ActiveX controls

http://technet.microsoft.com/en-us/library/ee681792.aspx

>Are you running the regsvr32 command as an administrator (right click, run as administrator)? Windows 7 will use a sandbox mode for registry changes, which will cause the command to report as successful, but the changes will be undone as soon as the process finishes.