EP6SP2 ,Error while trying to install mssql database using sapinst

When trying to install mssql database using sapinst,we reach a window,where we are being asked to create pcd and wcm.However it is unable to proceed after that.The log file contains the following details:

<b>ERROR 2005-02-08 15:31:48

MDB-05038 Error when connecting to "blrkec28781d"; Reported error: "[SQL-DMO]Service Control Error: An instance of the service is already running.

"</b>

<b>ERROR 2005-02-08 15:31:48

MDB-05034 Call to a threaded function returned "1".</b>