Hello again,
thank you ScinteX for your advice and suggestions.
I tried all?? possible solutions:My O/S is Win XP Home "see 1st post" so the link didn't help,I even e-mailed Symantec (following your suggestion to search in google)but nothing worked.
I'm taking NIS back for one of the following:
Antigen (by Sybari), Authentium, avast, AVG Anti-Virus 7.0,
Bullguard, DrWeb32, eScan, eTrust, F-secure, GFI Mail Security, H+BEDV's Antivirus, Kaspersky, Mcafee, NAV, NetZ Antiviral Utilities (Invircible), NOD32, Norman, Trend Micro, Panda, Protector Plus, Quick Heal, RAV Antivirus (GeCAD is gone to MS!), SRN Solo antivirus, Sophos,SurfinGuard, Synbridge Anti-Virus, V3Pro 2002 Deluxe (by Ahnlab), Vet Antivirus, Vexira Antivirus, ViRobot Expert,VirusBuster or even get one of the free ones ( ANTIDOTE for PC Viruses - SuperLite, AntiVir Personal Edition, AVG free, VCatch Basic).
For a firewall I'll use Win XP's after SP2