After receiving a new desktop for my daily duties I had to install the Developer Edition of SQL Server 2005. Once that was done the first thing I do is install the first Service Pack for SQL Server 2005 that was release not long after the release of SQL Server 2005. Anyway during the installation I received a very "user-friendly" dialog box notifying me that some locked files were found:

Apparently the setup bootstrapper of the SQL Server 2005 Service Pack installer does not check for running services that need to be stopped first. Look at the services panel I saw that the following services were still running:
- SQL Server Browser
- SQL Server Full-Text search
- SQL Server Integration Services
After stopping these services I was able to continue the installation.
Cross-posted from
The .NET Aficionado