Is this setup enough to prevent viruses

I am having a Linksys WRT54G router which has inbuilt SPI firewall in it. I know that firewall devices are more safer than firewall software's. I am running Windows XP Pro on my computer which, as everyone know, has Windows Firewall software and I have disabled it. I am having Mcafee antivirus software with firewall feature running on it. Now my question is that is this setup enough to prevent viruses on my system?

Ideally it is very difficult to specify whether the setup is opt for preventing viruses or not. It completely depends on the sites on which you visit and the types of downloads you make.

IMO your setup is perfectly ok for your general use but also needs to take care about your browsing habits as said by Yitzchak909.