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Web Report Viewer error - Unable to load client print control.

Dear All,
We have a problem with Report Viewer print funtionality. Getting the error "Unable to load client print control." on click of Print button.
We tried all solutions posted in web - nothing resolves the issue.
The print works fine when we open the report via a browser. But the same is not working through our application. We have the application installed on the Report server itself and the user has Admin previleges.
Please find below the details
Report control: ReportViewerWebControl.axd
Version: 9.0.30729.4402
SQL server version: SQL Server 2008 R2, 10.50.2500.0 (running on Windows Server 2008 R2 - 64 bit)
Your help on this would be highly appreciated. Please let me know if you need any specific information.
The best answer: Hi, Larry,
Thank you for your answer which remind me and lead me to the resolution. I have struggling on this SQL Server Report Server 2012/Client printing control for
2 days.
I just cannot figure out why it kept prompting non-admin XenApp users for SSRS installation. Thanks for your notes again.
I have 2008 R2 server setup as XenApp server for the publish apps. We published the IE to user to access Web application with SQL 2012 reporting service in
the backend.
In the control environment, users do not have permission to install any software. This SSRS has to be installed as administrator under “Install mode” in XenApp
Yes, 32bit IE works for me but 64bit IE works too.
You just need to ensure which version of IE you’re using to install the SSRS. I’m not aware of using 32bit IE for SSRS installation in server but publish 64bit
IE to client.  That’s my mistake.
Thanks again.