You try to start a Windows Vista-based computer that is running one of the following software components:

• Roxio Drive Letter Access (DLA)
• Roxio Drag-to-Disk
• Sonic Solutions

After you do this, you may receive an error message that resembles the following:

The Sonic Solutions DLA Driver is blocked due to compatibility issues

When you try to upgrade a computer from Microsoft Windows XP to Windows Vista, you receive the following error message in the compatibility report, and you cannot upgrade Windows:

You must first uninstall Sonic DLA

Note This problem occurs even though you do not have Sonic DLA installed. This problem also occurs even though Sonic DLA does not appear when you double-click the Add or Remove Programs item in Control Panel.