Hello Sue,
1)
Uninstalling a software, unfortunately, does not mean that every entry or file, of this software, is deleted from your harddisk or registry.
Roxio is one of them.
2)
Many software recreates automatically deleted entries.
The workaround for this is to check in "Registry Cleaner" > "Advanced options" the option "Don't show items that would be automatically re-created"
Hope this helps you.
Jean-Paul