Do this on-line scan first :
http://www.bitdefender.com/scan8/ie.html
only if you might be worried that you could be infected now.
then go and get avast for full time protection,
you can not get a better anti virus system for free.
it has many features you will have to pay for in other systems.
http://www.avast.com/eng/avast_4_home.ht…
don't forget to register or you will only have it for 60 days
by registering you will get a licence for a full year.
just re-register at the end of the year to get another one year licence.
if you feel you would be even safer with a software firewall
then
try this one it's also free and it has no conflicts with avast
http://www.pctools.com/firewall/
if you dont like the look of avast then pc tools
have a simpler free a- v- system :
http://www.pctools.com/free-antivirus/
i am trying it out myself at the moment so far it seems OK.
going online with no protection is a very stupid thing to do.
☼