Installation of SQL Express fails with the error "unable to load sqlboot.dll" when attempting to reinstall Backup Exec for Windows Servers (BEWS)

Problem

Installation of SQL Express fails with the error "unable to load sqlboot.dll" when attempting to reinstall Backup Exec for Windows Servers (BEWS)

Error Message

Unable to load sqlboot.dll

Cause

This issue occurs because XML 6 is not installed properly.

Solution

To resolve the issue, uninstall XML6 from Control Panel -> Add/Remove Programs and reinstall it. The SQL Express BKUPExec Instance should install successfully afterward.  
 
Microsoft Core XML Services (MSXML) 6.0

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