The Install Log shows the following.
2013-05-28 08:14:09.416 ArePRTGServicesRunning 2013-05-28 08:14:09.416 ArePRTGServicesRunning => FALSE 2013-05-28 08:14:09.416 Skip StopMsgPage TRUE 2013-05-28 08:14:09.416 d2 2013-05-28 08:14:09.416 d1 2013-05-28 08:14:09.416 IsAppMutexBlocked 2013-05-28 08:14:09.416 IsAppMutexBlocked => TRUE 2013-05-28 08:14:09.416 Skip StepExePage FALSE 2013-05-28 08:14:09.416 d2 2013-05-28 08:14:09.416 d1 2013-05-28 08:14:09.416 ArePRTGServicesRunning 2013-05-28 08:14:09.416 ArePRTGServicesRunning => FALSE 2013-05-28 08:14:09.416 Skip StopMsgPage TRUE 2013-05-28 08:14:09.416 d2 2013-05-28 08:14:09.416 e1 103 2013-05-28 08:14:09.416 IsAppMutexBlocked 2013-05-28 08:14:09.416 IsAppMutexBlocked => TRUE 2013-05-28 08:14:19.416 Waited 10 seconds 2013-05-28 08:14:19.416 IsAppMutexBlocked 2013-05-28 08:14:19.416 IsAppMutexBlocked => TRUE 2013-05-28 08:14:19.416 e2 2013-05-28 08:14:19.416 Failed to proceed to next wizard page; aborting. 2013-05-28 08:14:19.416 Got EAbort exception. 2013-05-28 08:14:19.416 Deinitializing Setup. 2013-05-28 08:14:19.416 Log closed.
Add comment