Custom Report by Event ID has unnecessary information

HI

I need to generate reports for user logon/logoff information (both failure and success) and send auto-mails to designated persons.
I'm generating a Custom Report using the following filters
Event ID - 538 & 680.
Deselected everything under Event Type / Event Severity
Message Filters - I entered only the usernames for which I need the logon/logoff information
Deselected everything under Filters for Syslog Hosts
Scheduled the report to run Daily at a specified time to generate report for the last 24hours.

The final report generated consists of information pertaining to the Event IDs mentioned in the Filter as Security process [ Security ]'s events
but it is also including unnecessary information such as :-

System process [ EventLog ]'s events
System process [ MRxSmb ]'s events
System process [ MSFTPSVC ]'s events
System process [ Service Control Manager ]'s events
System process [ WinHttpAutoProxySvc ]'s events

and these fields say -"No Data available for the selected time period from 2007-10-08 12:40:12 to 2007-10-09 12:40:12 "

How can I prevent these System Process logs to appear in this report, I need to exclude these from my Custom Report.
I'm attachnig one such report .
Please advice

I can also be reached at raktimde@indiabulls.com