XP security

Hi there, I have just spent the last three days cleaning my computer which has been infected with a trojan. What I have now is more a security question in order to further prevent these infections. I am using XP SP2, and have multiple profiles. All profiles except 2 are limited accounts. I am also using AVG as my virus protector. By using multiple accounts, am I full covered by AVG, and other various malware programmes that are running or is my security compromised by having these other profiles.

 

Thanks for the info - you have reinforced what I had already thought - plus some extra handy info.