Can I use two anti trojan applications?

[markysparky]

Can I use two anti trojan applications? Anybody know? Im using norton as an antivirus but would like to use a couple of anti trojan apps to protect against trojans. I have ewido installed and am looking at installing a secondary anti trojan app

 

[markysparky]

thanks for your replies, its good that there are knowledgable people who are able to help