Norton Toolbar malfunction

When I started IE8 today, there was no Norton Toolbar. I right clicked on the toobars and Norton was selected with a check  mark. I tried unchecking and then checking the Norton Toolbar but nothing appeared. I went into Tools>Manage Add-ins and there were three item: Norton Toolbar ,Symantec NCO BHO and Symantec Intrusion Prevention. I disabled them all, exited Tools, went back into Manage Add-ons, enabled all three previously listed items and when I exited all that appeared in the toolbar area was a small square with the same type of "X" that you see when you want to close a tab. I exited IE8 and rebooted Windows (XP Pro for your info). When I started IE8 again the same problem existed. What can I do now? PS I'm using NIS2011