When you click the print button from the ReportViewer control (Sql Server 2005)you get the
error: Unable to load client print control
I never had this issue with ReportViewer control (Sql Server 2000).
After doing some research it came out that there were many solutions to this depending on your environment.
1) Installing the RSClientPrint.Cab which can be found in the program Files\MSSQL Server\Reporting Services\ReportSerer\bin\.. folder.
But with this you would have to deploy this cab to all the clients.. hmm...
2) The second solution is to remove some security updates from > Control Panel > Add/Remove software but make sure the 'Show Update' checkbox is checked. Look for security updates 956803 and 956391 and remove them.
And that sould do the trick too..
3) I reckon the this last option is the way to go .
Just go and download : Security Update for SQL SERVER SP2
After installation it worked like a charm 