Can't launch Norton Antivirus 2010 after reboot

Hi,

 

I purchased Norton Antivirs 2010 2 weeks ago.  Installed it, executed LiveUpdate a few times, scanned immeadiatly my pc.  Installation was succesful, full system scan was also succesful.

 

After rebooting, when double clicking on the Norton Antivirus-icon on my desktop, it does nothing.  After a while I get this error: Error 8504,104 after I install my Norton 2010 product 

 

Some necessary info and steps I already executed:

- Installation is doen with Administrator rights

- Operating system: Vista 32-bit

- Followed the steps mentioned on this page: http://www.symantec.com/norton/support/kb/web_view.jsp?wv_type=public_web&docurl=20090916123608EN&pvid=nis_2010&selected_nav=6

It didn't solve my problem

- I chatted an hour with someone from norton.  He told me to uninstall Norton with the Norton Removal tool again and reinstall it with NAV-UPGRADE-ESD-17-5-0-127-NL.exe.  Even this didn't solve my problem.

- Fileversion of the executable on my desktop: 17.5.0.127

 

Are there other solutions?  I would really appreciate some help

 

Thanks!

Isabel