Ok guys i figured out the problem. The speed was actually 8,56KB/s vere-very slow speed at download from xbox and a bit higher at upload but still very slow. After many testings with software and drivers i CHANGED the nic with a 3com 10/100 and used the microsoft cetrified drivers and now i get at big files more than 4600 KB/s which is what I should expect. Conclousion: First we have to change the net card with a new one more reliable.................Thanks guys for the interest