Upgrade Blocked
The Microsoft SQL Server component you have selected to upgrade is blocked. The Upgrade Blocked dialog displays the cause of the block, and the user action necessary to remove the blocking issue.
To continue with the upgrade process, remove blocking issues, and then run Microsoft SQL Server 2005 Setup again.
See Also
Concepts
Using Upgrade Advisor to Prepare for Upgrades
Other Resources
Upgrading to SQL Server 2005
Backward Compatibility