Were you both using Cable modem connections with light authentiaction on the packets? Or did one of you have a nice size payload of authentication (DSL PPPoE) on every packet?
You only discussed networking hardware and code, Browser brand (not necessarily versions or added extensions), and a couple windows OS settings. There are a few more things that may still be different causing the different results.
IDW4U as it relates to D-Link hardware. Instead of IDW, which means we have to makes changes to the product.
It Doesn't Work.