Hello Valerie,
Probably, There is corruption within the installer database for the SQL Anywhere.
Try to repair the installer database, using the Microsoft Fix it tool "Fix problems that programs cannot be installed or uninstalled".
Hopefully afterwards you will be able to uninstall the SQL Anywhere.
However, this tool doesn't uninstall the SQL Anywhere.
After having repaired the installer database with the tool, you have to uninstall the SQL Anywhere.
Thanks