It sounds like Firefox wasn't completely removed, and Spybot Search & Destroy was finding enough remnants that it tried to immunize. When all the files weren't found, that caused the immunization hang.
Uninstalling Firefox
It sounds like Firefox wasn't completely removed, and Spybot Search & Destroy was finding enough remnants that it tried to immunize. When all the files weren't found, that caused the immunization hang.
Uninstalling Firefox