As a double-check, you should re-assess the network (as outlined in part one) to ensure that all patches were properly deployed. There are many reasons why deployments fail including mismatched patches (placing an MSDE service pack on a SQL Server instance, for example), locked files and attempting to apply hotfixes to the wrong service pack level. If you chose a non-interactive deployment strategy -- i.e., remote deployment -- then you may not have seen the interactive messages signifying the aforementioned problems (as most of the installers will warn you of mismatches).
HOW TO PATCH SQL SERVER, PART 2
Step 1: Segregate your scan results
Step 2: Obtain service packs and prepare for deployment
Step 3: Deploy service packs
Step 4: Obtain hotfixes and prepare for deployment
Step 5: Deploy hotfixes
Step 6: Re-assess network
Step 7: Plan next assessment
Back: How to patch SQL Server, part 1
ABOUT THE AUTHOR:
Chip Andrews is the director of research and development for Special Ops Security Inc. and the founder of the SQLSecurity.com Web site, which focuses on Microsoft SQL Server security topics and issues. He is also the author of SQL Server Security.