This was taken from here
http://windows7forums.com/windows-7-support/4354-program-icons-missing-all-programs-menu.html
"I thought MSPEEDO was on to something, so instead of going through the process he went through, I simply right clicked on "all programs" in the start menu and chose "open all users." Then I went into the Programs directory and began deleting icons and folders, bringing the number down to 70.
Lowe and behold, I clicked on start, all programs, and everything was back.
Either this is a bug, or Microsoft has intentionally put a 70 item limitation on start menu items....
For now this is the workaround.
// Just because I am insanely curious, I went back and created a bunch of test folders to see if the items in the all programs menu would go away. I originally had 106 items in the start menu, so I went crazy and added 133 by creating random folders and moving files and shortcuts here. The All programs menu did not dissapear, and all items were displayed.
I think this is a bug that occurs during the upgrade process of one build to another. It happened specifically for me after I went from 7057 to 7077. I currently run 7100.
So this is a fix, not a workaround."
Hope that ends up working for ya. Google search does wonders.
If you're implying piracy. Torrent and torrent programs are used by piracy but the original idea for the program and idea is sending large data files over the internet at exceptional speeds. Many companies use it, mainly tv studios.
If you mean other wise and want to know about uses for a program like uTorrent and bit torrent technologies check this out:
http://en.wikipedia.org/wiki/BitTorrent_(company) and
http://en.wikipedia.org/wiki/BitTorrent_(protocol)