I have seen this type of problem from Norton thousands of times. Ocasionally Norton will see a virus and will disable itself and not allow a re-enable or runing of the software. Its sort of Norton's method of running and hidding. I have recently moved to Mc Afee and I am yet to see Mc Afee run and hide from anything. My advice is to purcahse Mc Afee or Zone Alarm's Security suite.