Lost all my µTorrent downloads !!!

Stop using the disk immediately. This will ease recovery.
uTorrent also causes me problems. It BSOD the IPv6 driver.

Again, if you have your BitTorrent downloads going to your µTorrent folder, and you manually delete that folder, you will delete all your downloads. This is a fact of Windows. Generally an uninstaller will only touch files it's installed, but µTorrent does not include one.

As the other guy said, stop using your computer. Only use it to download Recuva. Run it, with a deep scan, and WAIT. It will take some time but it will recover your files if Windows has not overwritten them. Deleting only removes the header so Windows can't see it; the bits are still there, they just can be overwritten at the system's discretion.

When I got done playing Fallout 3, I uninstalled it, and yes, I wanted to remove the ~8GB of data as well (the five expansions). Not the same thing, but a workable approximation.

Next time change the download folder, e.g. to X:\Documents\Downloads where X is the drive letter of your portable device. Also, don't even torrent off or to a flash drive. That will burn through its limited write cycles in no time. You should only torrent off or to a hard disk drive.

It can definitely be declared as the users responsibility to remember where he has downloaded his files to. When uninstalling via the platform, the unsinstall window clearly states, what folder it is going to delete. If you stored your downloaded files there and still chose to delete the folder, bad luck.
As others said, it may not be a complete loss - if you really stopped accessing the drive. That includes running windows if it is installed to the same drive or f.i. something like the temp folder/hibernation or swap files are located there (Remember, in large files even a write access to a single block may render it useless).
If so, you best do a recovery from "the outside" booting a live linux with testdisk or a Win PE derivate like Bart PE. Or if you have access to another computer, mount the drive there and do an undelete from that computers OS. (Disclaimer: Advices are not without risk, if you don't feel you can manage it, better ask someone capable to do it for you.)

Good luck, though.

Not to "hit you while you're down," but you should take some ownership and responsibility for your actions. I, too, have accidentally deleted critical files. Dumb mistake, but it happens.

The difference is that, when it's happened to me, I've almost always had another copy of those critical files on external media.

Hard drives can die, too, so this may be a good time to think about your disaster recovery plan. How much and how often should you back up? Well, how much data can you afford to lose?

In John's defense, a generic uninstallation routine that asks "are you sure?" is doing its job, and should not be ignored. You really had no clue that those 10-20 Gb of data were inside that folder that you allowed to be deleted?