Should i install any of these norton antivirus,,norton personal firewall,antispyware ???

from bt yahoo! online protection...i already have spyware doctor and AVG free....thanx!!

Should i install any of these norton antivirus,,norton personal firewall,antispyware ???network security

I wouldn't, Norton can be resource hungry and difficult to uninstall.

All the following programs are free for personal use;

You need to install one firewall.

The Windows firewall doesn't stop malware on your pc from dialling out.

http://www.zonelabs.com Zone Alarm firewall

http://www.comodogroup.com/ - Comodo security suite.

You need to install one anti virus;

http://free.grisoft.com/freeweb.php/doc/... -AVG anti virus or

http://www.avast.com - Avast Antivirus

You need all three anti spyware programs;

http://www.ewido.net - AVG(Ewido) anti trojan.

http://www.lavasoft.com - Ad-Aware SE Personal anti adware

http://www.safer-networking.org - Spybot Search and Destroy anti spyware

And these are useful utilities;

Shields Up security site;

https://www.grc.com - check your firewall works

http://www.grc.com/optout.htm - grc anti spyware program and info.

http://www.mozilla.com/ Firefox web browser and Thunderbird e-mail program.

http://www.opera.com/ Opera web browser

Instal both these web browsers, turn off javascript on one and use that browser for vising unknown websites. They don't support Active X so thats one less way for problems to get on your pc.