Kazaa. Thats yer problem. Kazaa, land of fake files and trouble by the free truck load...
Try DC++, I transfer several hundred gigs a month and have yet to get a virus or a wrong named file. The way the system works is what makes the difference. There all privatly owned hubs. Which does a few things, 1st makes it illegal for any outside athority to mess with you. 2nd allows the hub owners to police it. you fake share or have bs files you get banned. It's the best file share system I have ever used. Plus they all have chat and most of the better hubs will have killer conversations going on constantly.
Its a riot in some of them charecters crackin jokes and teasin each other.... gets outta hand at which time a bot tells everyone to behave or be booted LOL some of the bots have a sense of humor like Robbin Williams they can be hilarious with there responses to certain "key words"