if pc A took 1:30:00 but pc B started after A was finished, the download appears to have been cached.
try the download speed tests at http://www.speedtest.net and/or http://www.dslreports.com/speedtest. both of you PC's should give similar results -- if not, something's wrong with the slowpoke.
I have a question regarding Built in LAN connections. I have two desktops that are being readied for use in my shop. Both have Win 7 64 bit, one Professional and one Home premium.
When I wanted to download a file to install on each of them, a 350Mb file, one desktop took over an hour and a half to do so, where the other desktop came in at about 8 minutes. Same LAN, Realtek RTL8111D on both boards, although different manufacturers. One Gigabyte board, one MSI board. Any ideas what might have caused this? Perhaps a bad driver??