There are a lot of bad files being shared on the network, probably by our friends
at the RI** and MP** to try and discourage people downloading files. Try staying away from files being shared with a "T3 or Higher" connection speed and try downloading files with only a few sources instead of the ones with the most.
It's not a problem with LW. It's the files being shared. Over time you'll get a feel for whats good or not. A lot of it is trial and error.
There is a lot of good info in the
stickies at the top of each forum. Here's one you might want to check out:
Major Topics for Upload/Download Help