I see you have been cleared of any Malware by BHowett over on the HJT forum. Those Malware fighters are great aren't they?
To answer your question re Antivirus software, I would recommend Avast Home Edition as I have it on my systems. It is self updating, easy to manage, and has not let me down since changing to it from AVG 7.5.
Keep us posted what you decide to do as others will come by with their recommendations.
