When doing a search on the net for your particular problem, you will find this is a common complaint with various causes and possible solutions. What works for one person may not work for another.
However, there were two common suggestions to resolve the issue.
First, a patch was released so run Live Update manually and look for the COH updates. Reboot afterwards.
Second, you have to uninstall NIS completely from your system using the Norton Removal Tool (SymNRT)
for your version of Windows and then reinstall it.