Comment XP has small tcp window size by default (Score 1) 515
Regedit this, reboot, done, no need to complain to the entire world. Any sysadmin should be able to give you the solution.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"TcpWindowSize"=dword:0000faf0
"SackOpts"=dword:00000001
"Tcp1323Opts"=dword:00000003
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters]
"DefaultReceiveWindow"=dword:0000faf0
"DefaultSendWindow"=dword:0000faf0