My guess is you're finding dud files in your search results. Dud files are spammed for copyright material. You'll get like 100 for one, 99 sources for the next, etc. So I'd recommend you choose those with 10 or 20 sources under the # column of the search results. Normally choose those with 3 or 4 stars as that represents your chance of a successful connection & downld. Perhaps to help get rid of some of these dud files from your search results, see Sponsored Results (click on link) & apply those terms to your keyword filter.

Also, if you like downloading videos, see Movie download issues & learn to use Bitzi lookup to see if there's been user feedback on the particular file.

Since you're using XP SP2, you might consider these MS & 3rd party patches