hi,if you are ok with then stick with it,i rebuild older systems for charities and any one who cant afford one,so it gives me a great oppertunity to test free software.
i download most of my stuff from"major geeks",an excellant site,at the moment i am using a combination of :active virus scan which you can download from aol and is free and is kaspersky and runs in realtime:arovax anti-spyware which is also free and also runs in realtime:filseclab firewall.
i use as a backup :advanced windows care and super anti-spyware both free versions.
i will try commodo anti-virus on one of the systems and see how it go,s.cheers alex