We used to run Norton here at work, but now have moved to avast! as I've been using it at home for a while and like it. This problem only happens on one computer. All of them used to have Norton installed and it was removed the same as the problem computer.
I bet that NAV was poorly uninstalled in this computer...
1) Remove NAV through Add/Remove programs from Control Panel. Boot.
2) Use Symantec removal tool following the three steps defined in the
SymNRT tool info.
3) Boot.
4) Install avast! Boot.
5) See what you get.
Full SymNRT info:
1. Download and save these three files to the Windows desktop:
a)
ftp://ftp.symantec.com/public/english_us_canada/linked_files/tsgen/MSIFIX.bat b)
ftp://ftp.symantec.com/public/english_us_canada/linked_files/tsgen/SymNRT.exe c)
ftp://ftp.symantec.com/public/english_us_canada/linked_files/tsgen/SYMMSICLEANUP.reg2. Run the three files that you just downloaded
a) On the Windows desktop, double-click the MSIFIX icon.
Click Run.
A black window may appear very briefly.
b) On the Windows desktop, double-click the SymNRT icon.
Click Run.
Click Next.
Click I accept the License Agreement, and click Next.
Type the letters and numbers that you see in the white box, and then click Next.
Click Yes or OK at each prompt.
You may need to click more than once. Your computer may be restarted for you more than once.
You may be asked to repeat some steps after the computer restarts.
c) On the Windows desktop, double-click the SYMMSICLEANUP icon.
Click Run, and then click Yes.
Click OK.
3. Boot.