REGEDIT4

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP]
"Tcp1323Opts"=dword:00000003
"SackOpts"="1"
"BSDUrgent"="1"

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP\Parameters]
"GlobalMaxTCPWindoSize"=dword:00000860