Should I use Bit Defender?

At the moment I have Zone Alarm firewall, Avast anti-virus and Windows defender.

But, I have been offered Bit Defender Internet Security 2008 by a friend.

My question is, do you think I should use this insted of the progrmas I have running at the moment, and if so should I keep any of the other ones on.

Also, any advice you have about getting other selections of software, to protect my PC toher than the ones I have now is appreciated (i'm looking to upgrade my security software).

Thanks in advance

Should I use Bit Defender?firewall

BitDefender is an excellent anti-virus, also Nod32. both very very good and well worth it.