Roxio Update Manager is looking for UM.MSI file which doesn't seem to exist on your computer. You have windows XP professional on a Dell you purchased. So what you get is a screen saying to find it another way.
You don't seem to have a Roxio disk in your Dell paper work other then a Roxio Easy Creator 9. This is a problem that forces you to hard boot your computer in order to turn it off. You can't even remove your program through Windows add/remove programs.
You have tried to uninstall Roxio update manager. Also, you have tried looking for an UM.MSI file through windows search. If Update Manager fails to uninstall, corruption has occurred that prevents removal.
You will have to manually remove Update Manager:
Go to "My Computer" then C:\\Program Files\Sonic. If there is a folder named "Update Manager", right click on it and select delete. Browse to C:\Documents and Settings\user name\Application Data\Sonic and delete that "Update Manager" folder.
NOTE: You may need to enable hidden files. Do this within Windows Explorer by going to "Tools" then select "Folder Options". Select a "View" tab and then select "Show Hidden Files and Folders".
You can then periodically check for updates, for your Roxio software, as long as Roxio still supports your software, from this Corel KBSearch Articles page on Roxio's support site. Also, you can upgrade to a newer version of Roxio Easy Creator to try to get your current version working again. This will require an additional cost.