Well lemme check your Log

It seems that you don't use an anti-virus scanner or your scanner is not active. Only an anti-virus scanner can protect you against new viruses.

I couldn't detect any active process of a firewall on your system. Possible reasons:
(1.) You are using the windows firewall or a hardware firewall.
(2.) You are using a firewall of an unknown vendor.
(3.) You are using a firewall, but for unknown reasons it is disabled
(4.) You don't use any firewall at all.

I recommend you to use a firewall. Download and install one or activate windows xp´s own one. In case you got questions or you want us to add the firewall you use to our database.