first off,if you have windows me or xp the make a restore point.if things go wrong you can always go back.
uninstaller click here
1. norton is as good as any other av if kept up to date and run regulary.i myself use free avg click here as my antivirus and have tried both free zone alarm and free outpost click here click here both very good.
2.the free ones uninstall via add remove programs.norton sometimes is a wee bit more difficult to remove completly as you have to run the rnav2003.exe utillity after add remove progs to fully get rid..
3.if it works on your system and gives you no problems then use it.if it gives problems then dont.some people like it others dont.opinions vary on the subject or systemworks.
4.systemworks contains norton antivirus so.yes i would uninstall any standalone version and then reinstall it as part of systemworks and update it.see how ya go.click here for the symantec knowledge base.