First please go here and check whether its functioning well. Sun Java Site
If it doesn't work follow the steps.
Get latest updated one from here
This problem happens when Norton Internet Security or Norton Personal Firewall has been configured to block scripts, ActiveX controls, Java applets, referral information, or advertisements.
ActiveX controls and Java applets can be blocked by customizing your security settings from the main interface. To find out whether this is the problem, read the section "Customize security settings."
All of these security features (scripts, ActiveX controls, Java applets, referral information, and advertisements) can be blocked by specific Web rules. These rules are located in the Advanced Options of the program. For scripts, ActiveX controls, Java applets, and referral information, see the "Web rules" section of this document.
You have to configure the settings of your antivirus suite or/and firewall.
Since I do not know which version of Norton you use (if you provided the version I could guide you further.
Even if you have uninstalled the settings would be there.
How to enable Java if disabled...
This answer is aimed at Java Runtime and Plugins in a Windows environment. Not aimed at any other operating system including Java Desk.