Check out this thread on how to fasten downloads for utorrents:
softblogger.net/speed-up-utorrent/
It worked!
If you have already started download process, and later find that the drive does'nt have enough free space, don't worry. You can change the download location using the steps given in the following url:
http://www.online-tech-tips.com/computer-tips/how-to-move-a-half-finished-download-in-utorrent/
Depending on the size of files, it might take from a minute to several minutes to move the files to the new location.