|I think the original poster has longs since vanished. Just in case, my take is that you need a real-time Anti-Virus which runs in the background. My choices (all free):|
Microsoft Security Essentials.
Not too much to choose between the first two (personal preference). AVG is a bit bloated but I have included it just in case.
There is a lot to be said to then have a freebie which is a finder-fixer to scan on demand for anything that might have got through. Freebies:
MalwareBytes (probably the one now most favoured for this function).
SuperAntiSpyware (which can be used in real-time instead of an Anti-Virus).
You should only have one product checking in the background. Anything else should be only for use on demand.
We all live on a ball.