how to open torrent file. please help. thanks a lot.

I have used BitComet as the BT client software. It provides you good download speed with low demand in CPU resources only.

You can download it from
http://dw.com.com/redir?pid=10602759&merid=6257627&mfgid=6257627&ltype=dl_dlnow&lop=link&edId=3&siteId=4&oId=3040-2196_4-10602759&ontId=2196_4&destUrl=http://www.download.com%2F3001-2196_4-10602759.html

Here's some information provided from Cnet.Download.com

BitComet is a powerful, clean, fast, and easy-to-use BitTorrent client. It is P2P file-sharing freeware and one of the most popular P2P protocols designed for high-speed distribution. BitComet supports simultaneous downloads, DHT networks (trackerless), a download queue, selected downloads in the Torrent package, fast-resume, disk caching, speed limits, auto port mapping, proxies, and IP filtering. Version 0.76 fixes a bug which it is possible to download corrupted file in the version 0.75.