I don’t know if the Update Rollup 1 is likely to be the cause, as I would have hoped that this would have been identified before installation.

If it isn’t the problem and possibly worth doing anyway - I suggest that you run the Norton removal tool as it has form for leaving remnants behind and that could cause conflict.

A link worth looking at, which is a program removal tool that can remove the remnants of a number of different Norton Programs:
Removing your Norton program using SymNRT
Or ftp://ftp.symantec.com/public/english_us_canada/removal_tools/Norton_Removal_Tool.exe