OKay, I fixed the packet loss problem (it was caused by a bug in win98 that caused packet redirection etc. I downloaded a patch and it fixed the packet loss problem) and I am no longer getting reports of throughput bieng limited by other network traffic or suggestions of adjusting reciever buffer size. Everything looks fine now but I am still only getting around 60-68% of my hosts average rate.
See, all better!
removed your IP adress, not a good idea to post em in public