It's customary to offer others like Linda some points when they offer you suggestions. Have a look for the file ovapp_msi_HPOvObsSv_install.log and look for line which have return code higher than 1 for the real error message. So the error line will not be in the end of the file as expected but in the middle of this file. Ignore keyword of errors in the property section near the end as they are like hardcoded error message to be used and not the real error message.
Make sure you have the following 1. SQL 2000 sp3a or higher 2. J2re 1.4.2_8 3. Log in as (SA) to connect to the database 4. TCP/IP is enabled in SQL network utility 5. Make sure that the ports for SD 5.0 do not conflict with other ports in the your network