why does every game download have a virus
 

can anyone tell me why everytime i download a game file it has a virus attached to it

You do have to be really careful when downloading zip & exe files, they're often infected. Infecting files is a way to discourage people from using p2p apps! Your AV sounds like it's working, that's good;)
This thread is worth reading, it has a lot of info about virus problems
WARNING: Viruses on the network you should be aware of