It seams that Bittornado is for Win XP 32bits (w32):
Code:
http://www.bittornado.com/download.html
So try this first, just choose between XP 64 and Bittornado.
If you want keep W64, just find a compatible torrent client.
If you want to keep Tornado, choose W32 ^^
And yeah, the "tcpip.sys" thing does not decrease downloads, it just limits number of SIMULTANEOUS new connections, but not the entire number of connections. You [just] can't connect more than 10 new peers per seconde (600/minute).
Ten minutes later and you're a six thousand peers connected man (if allowed by your BT client
)!