If you are missing the default reports that should be installed on an SMS 2003 Reporting Point you may need to do the following:

Replace REPLACESITECODE in the _smsrpt.mof file (usually found at C:\SMS\bin\i386) with your site code.

From a command prompt run:  mofcomp _smsrpt.mof

SMS 2003 R2 comes with 150+ pre-built reports.