Everytime I download "Gnotella" the only thing I get is a blank screen with the "Quicktime" logo in the center of my screen. How do i install it in my computer?

from where are you trying to download? if you don't use it already try

http://www.gnutelliums.com/download/gnotella.shtml

and check the two download locations provided there. if you still don't get a "gnotella.exe" or something like that, then there is something wrong with your configuration, i guess. try re-installing your browser then (or use another one).

hope this helps you on.