I had the exact same problem. To fix, I had to download the Microsoft Installer Clean Up utility from Microsoft.
You can then choose which packages you really don't want to install anymore, ie- Sonic Activation Module.
Cleaned up the problem immediately for me.
Ok...now I KNOW I need help!!!
I've been to Microsoft's Download page and nothing is jumping out at me as being specifically the one I need. Can you point me in the right direction please?
I did exactly the same as BungyAilin . I deleted everything to do with Sonic including entries in the registry, desperate measures I know, I should have called Dell support first (let this be a lesson). However, I don't use Roxio or Sonic software anyway.
Here's the link for the Microsoft Registry CleanUp tool:
Knock yourselves out :-)