I'd say that 99% of the unsafe files are actualy fine. This is just a bug with how shareaza works with win 2K, I believe. Check the Shareaza forums. I've checked files which were unsafe and all the one's I've downloaded have been fine. Stick with Shareaza and wait for the next the 1.6 release. I have the virus protection as well as a firewall to protect me from most viruses and rogue executable codes so I am confident that the unsafe files are actually fine.

Good luck.