High CPU usage nu.exe

Hi, I'm new here. And sadly clueless.

I'm getting alert on high CPU usage 99%. I have copied below...

I can barely type into Explorer or Firefox search box. even when no applications open, nu.exe is grinding away..

Windows Vista X.64 on Toshiba Satellite E105

Hope someone can help.

Thank you!

Margot

 

c:\program files (x86)\norton utilities 14\nu.exe
____________________________
____________________________
Signature:
Symantec Corporation
Identified:
10/24/2010 at 12:50:05 PM
Last Used:
11/26/2010 at 6:30:15 PM
Start-up Item:
No
Version Number:
14.5.0.116
____________________________
____________________________
Many Users
Hundreds of thousands of users in the Norton Community have used this file.
____________________________
Mature
This file was released more than 31 days ago.
____________________________
Good
Norton has given this file a trusted rating.
____________________________
Origin

 

Source File:
nu.exe
____________________________
Performance
Avg. Resource Usage:
Moderate
CPUProcessAvg CPU Usage: Low     Avg Memory Usage: Heavy

____________________________
Performance Alert
Time:
 11/26/2010 6:29:59 PM

Process ID 668
CPU  99% of at least one CPU.
Memory  Normal
Handles Count  Normal
Disk Read Activity  Normal
Disk Write Activity  Normal
____________________________
File Thumbprint - SHA:
12083c19d9a90f6629e853dc2f46e9ff6488511a04c47ab5eb6d227f746f26bc
____________________________
File Thumbprint - MD5:
2e70e54a5835b384cbc8f66f20b08e43
____________________________