Besides that you should always scan any file (before opening) you've downloaded from the network for possible viruses, trojans and/or worms, it is also pretty risky to download .zip, .rar, and/or .exe files. In 999/1000 cases they are infected.
If you can't get rid of the virus by yourself, get free computer help here:
http://norbiesworld.co.uk/computerhelp 