Running ZoneAlarm Pro 9.1 on Win 7 x64 kills the throughput speed.
With ZoneAlarm running, the throughput is 30-50% slower. Shut down ZoneAlarm, and it goes back to what it should.
I am running the latest drivers for my NIC, and yes, at this point I have even tried different NICs, as well as different machines.
The problem is ZoneAlarm 9.1. This is a bug and it needs to get fixed ASAP.