maybe patching half open connections in xp to abt 50-100 would help??
set the half open connections in utorrent to half of what u will patch ur system
eg: if u patched it to 50 - set the limit as 25 in utorrent

and restrict the download to abt 5-6 kb less of total max kb and max upload limit to abt 3kb less than max upload limit, so that u can browse when ur downloading stuff.
eg: if max download is around 31Kibs in utorrent - so to browse without waiting for pages to load, set max download limit at 26Kib and max upload at 10Kib