"To receive the update, customers may need to first restart their PCs by selecting Start on the taskbar, clicking the Power button, and choosing Restart, not Shut down. Additional guidance can be found on our support forum here."
The problem affected various Windows users, with customers of major UK ISPs PlusNet and Virgin Media complaining about not being able to get online following last week's update.
The CDPSvc crash seemed to prevent PCs from getting Dynamic Host Configuration Protocol (DHCP) information from routers, a necessary step when assigning a local IP address to a device.
The exact Windows update that caused these problems is unclear, although it may be KB3201845, released on December 9. In the notes for yesterday's fix, KB3206632, Microsoft said this update replaced KB3201845.