hmm, neat. I didn't realize Windows bundled tcp acks into pairs.
For those (like me) who like to know what it does more precisely, it adds a few registry values under:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
for all subkeys (there's one for each "network interface", which is more than just NICs) it adds a DWORD called TcpAckFrequency and sets it to 1.
Here's a Microsoft KB Article on the effect
http://support.microsoft.com/kb/328890/
Basically it's like the page states... tcp acks are queued up to be sent in groups or when a timer expires. By default, it either sends the acks in pairs, or sends an ack after a 200ms delay.
I checked over the install script (god I hate VB) and it's all on the up and up. I didn't take the time to look at the others.