PTCL speed and latency on Windows 7 and Windows XP(post ur experience)

I am using 1 MBPS on 3 computers. i am getting below differences with window 7 and window XP

1 window XP based computer getting 1100 KBPS and latency around 109 at speedtest.wateen.net

2 Window 7 based computer getting 875KBPS and latency around 124 at speedtest.wateen.net

(ADSL modem plus LINKSYS BY CISCO router)

.

.

.

.

Please post your experience and remember to mention your operating system name (WINDOWS)