In the 
                     Status column of the execution server you want to activate or deactivate, click 
                     Inactive/Active. 
                      
                   
                  
                  Important: Because the installation of an execution server requires administrative privileges, the automatic upgrade of an execution
                     server fails if UAC is enabled. Disable UAC on all computers that host an execution server. 
                     		
                  
 
                  
                  Note: If the version of the execution server is an invalid older version, but later than version 
                        			 SilkCentral Test Manager 2009 SP1, the execution server is automatically upgraded to the current 
                        			 Silk Central version. 
                        			 Silk Central shows a message concerning the upgrade in the 
                        			 Information column in the list of execution servers. As long as the upgrade procedure is not complete, the upgrading execution server
                        is not used.