Could not find installable ISAM in ASP.NET

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ASP.NET

OleDb

Any of the following exceptions occurs (IIS 8) once or twice in a week.

* Error Message:System.InvalidOperationException: The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.

* Error Message:System.Data.OleDb.OleDbException (0x80004005): Could not find installable ISAM.

* Error Message:System.Data.OleDb.OleDbException (0x80004005): External table is not in the expected format.

Excel 2007 file is used. The code follows below.

string xlsxOleDBConnection = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0;HDR=YES;IMEX=1'";

DataTable dt = new DataTable();

using (OleDbConnection l_oleConnection = new OleDbConnection(string.Format(xlsxOleDBConnection, FileNameWithPath)))

{
string l_strSQL = string.Format("SELECT {0} FROM [{1}]", strColumns,    WebConfigurationManager.AppSettings["ExcelSheetName"].ToString());
l_oleConnection.Open();
OleDbCommand l_oleCommand = new OleDbCommand(l_strSQL, l_oleConnection);
OleDbDataAdapter da = new OleDbDataAdapter(l_oleCommand);
da.Fill(dt);
l_oleConnection.Close();
OleDbConnection.ReleaseObjectPool();
return dt;
}

After restarting the app pool, everything works fine for two to three days and again above exception occurs.