Most games either won't work (need a serial number/code) or may be infected. Stay away from zip, exe, rar files as they're often infected.
WARNING: Viruses on network you should be aware of!

Files which sit connecting for ages & then get stuck needing sources forever are fakes. Always check files with Bitzi before download. See the threads below for more info, including how to use Bitzi
Fake files showing up in search results

How to find music(tips for movies, too)