If you do a lot of installs its a good idea to have an automated process for provisioning SQL Server. A lot of people try to use "sysprep"
Here's a few reasons why not to use sysprep.
If you do want to plod on here's some links and tips
- How to rename SQL Server
http://msdn.microsoft.com/en-us/library/ms143799.aspx
- Renaming a Report Server Computer
http://msdn.microsoft.com/en-us/library/ms345235.aspx
- Don't start the SQL Server when sysprep is taken. This can help resolve the issues with SID values.
Alternative Approach
The best alternative is to add the pre-requisites to the base image, sysprep the computer WITHOUT SQL Server installed and then have the installation fully automated via a configuration file as per http://msdn.microsoft.com/en-us/library/dd239405.aspx
or with SQL 2005 you'll need the command line approach
http://msdn.microsoft.com/en-us/library/ms144259(SQL.90).aspx