Hi Patil
Could you refer the SCN thread with same issue. I think you have to upgrade the service pack of MS SQL 2005. Kindly follow the steps:
1. Stop the SAP instance.
2. Take the full backup of DB & SAP folders
3. Apply the latest service pack of MS Sql server 2005.
4. Start the SAP instance.
Is SQL Server 2005 RTM supported with kernel 721?
BR
SS