I have a network with 50 PC connected and a shared internet of 4MBPS speed. But when I use utorrent to download some files in a PC then other PCs got very low internet speed.
Is there any router to control the bandwidth of internet speed. OR I have to use PC software? Mostly I like to use a router for this.. help..

Honestly what on earth are you doing using a torrent client on a corporate connection!!

Utorrent will use ALL available bandwidth for downloading/seeding.

Never mind the fact that a lot of ISP will throttle the entire connection speed is they sense you are using something on a bittorrent protocol. The only thing I would suggest would be to try changing the port to a totally random one and then limit utorrents speeds to <90kbps (Maybe lower depending on network factors but start with capping to 90 then decrease if you still get slow speeds). These are the settings I run bittorrent at and they manage to keep my connection fast enough on my small home network.

4MBPS for 50 clients AND you want to run a torrent client?? You *will* slow down the entire network, that is guaranteed. Jettison the torrent use and you should see a gain, though if all 50 clients are being used internet access will still chug along slowly.

Quick Q. are all 50 PC's utilizing this internet connection at once?

If so WOW!!

Rick