Sure.
BitTorrent has nothing to do with the problems of spyware and other stuff. Lack of knowledge in it's use is the problem there.
For Horizons, you will need a credit card to play the 7 day trial as when the trial is up, you are charged for a subscription unless you cancel. (Pretty standard in the MMORPG industry).
I suggest you download a spyware removal program or 2 and clean up your computer before you do anything.
Also, these are the minimum specifications for your computer to even be able to run the software:
850 MHz or faster Pentium III / AMD Athlon processor, 256 MB or more RAM, 64 MB or greater supported Direct 3D and Hardware T&L capable video card / Intel Extreme Graphics 2 (with 2GHz or higher system processor), DirectX 8.1a or greater and a dial-up Internet connection.
Our recommended specs are a 1.4 GHz Pentium IV / AMD Athlon processor, 512MB RAM, GeForce 3 / Radeon 9000 or greater, DirectX 8.1a, and a DSL or Cable modem Internet connection.
(Taken from
www.istaria.com)