1) can we view torrent if we pause it at 30%?( i have downloaded the english learning course dvd contents but it got stuck at 96% with no seeds..can u tel me any software through which we can see the uncompleted torrents?
Which format is the DVD in? If it's avi/mkv/wmv, etc., you can try using Windows Media Player and Windows Media Center. Even though there are lots of better players which support much more formats, I have found that Windows Media Player / Center are the only players which are able to play incomplete videos (although not always).
If they are archived in rar or zip, you can try extracting it using 7-zip. It will extract the video to the extent it is able to. Winrar won't do the job, because it only works when the archive is complete and without errors.
2) i want to stop the uploading while downloading the torrents? can i do that is it safe to limit the uploading speed?
You can, but it's not recommended. Bittorrent is a peer to peer protocol, which means files are not hosted on a central server, but they are distributed by using the bandwidth of the peers; you are also a peer if you are downloading using bittorrent. If everyone starts to throttle their upload speed, no one will be able to download. If you can spare the bandwidth, don't limit the uploading speed.