Re Error 8506.421: I have downloaded and run Norton Removal Tool, followed the on-screen instructions, restarted the Toshiba running Windows 7 and re-installed Norton Security. I have also downloaded Norton Power Eraser and followed all the prompts including Rootkit scan. I restarted the computer, and followed the on-screen instructions for Norton Power Eraser. However I still get the same error message re Error 8506.421 that Norton cannot fix it.
Should I run Norton Removal Tool again and Norton Power Eraser again or is there another solution I should be considering?