I got the same problem last night and nearly lost 20Gb of data because of Roxio bugs. I managed to back up most of it but it was only after I backed that i saw this entry and sorted it out. I am glad rasu provided the link to the fix site.
The worst was that I lost all win updates and had to do them all over again. Until my computer crashed with explorer.exe errors and also task manager errors. Finally I used Repair option and now it is back up.
I do agree that people should know about how serious Roxio software unistallation is. I wonder...is there not a Roxio Fix for this? Haven't they managed to sort the bug out?
