If you check your MSSQL Server Error Log and encounter an error "Cannot use Large Page Extentions. Lock memory priviledges was not granted", it means you are running SQL Server 64 bit, but did not grant the account running it the privilege to lock pages in memory.
Please see our article: 'How to enable the "Lock pages in memory" security policy'.
Please see our article: 'How to enable the "Lock pages in memory" security policy'.