The failure of loading Office Viewer ActiveX control has the following possible causes:
1. The security settings of IE on the client machine are incorrect.
Please verify the following security settings of IE to “Prompt” or “Enabled”:
a) Download signed ActiveX controls
b) Run ActiveX Controls and plug-ins
c) Script ActiveX controls marked safe for scripting
The dialog box of the security setting can be launched from menu
Tools>Internet Options. Then select the security tab.