Error Message with SQL Server and Re-installing SQL

Your SQL Server installation is either corrupted or it has been tempered with (could not open sqlevn70.rll). Please uninstall and re-run setup to correct this problem.

I first began getting this message when working/learning about the use of Access.

From an earlier Dell Community forum response to another member's inquiry on this problem, the recommendation was:

Uninstall Microsoft SQL reboot then reinstall it.  Then apply service pack 3a.

 

1. How do I uninstall Microsoft SQL? This program is not listed in the Add/Remove programs listing.
2. How do I reinstall Microsoft SQL?

I have the operating system CD (Reinstallation CD Microsoft Windows XP Professional including Service Pack 1a) and the Microsoft Office Professional 2003 CD.

Thanks.