Jane doe, Hi.
Seems like you are having trouble with System Works and I really would like to be able to give you the solution to your problem.
However, there are too many possibilities for failures with installing Norton for me to be able to give you specific advice.
Unless you've already been to this page in their Support Site, I would suggest you have a look here
You don't say if it's the Pro or Standard Edition but I don't think it matters given the problems you've described.
Just a wee word of comfort. Don't give up on NSW. Quite a few others who may respond to this thread will tell you to get rid of Norton. NSW is far and away the best suite of tools you can have despite what quite a few others on this site may think. The problems usually come when you've had to uninstall and reinstall. Files get corrupted in the process but a trawl through the Symantec Support Site will eventually provide the answer.
Good Luck and kind regards,