Quick and dirty way of determining if you have the Scalable Network Pack (SNP) installed on your OS

Run the command "netstat -t" from a command prompt. If you receive an error message, which is expected for any OS without the SNP, you do not have it installed.

If you receive output that looks like normal netstat output, with an extra field called "Offload State", you have SNP installed.

It is also a round-about way of telling if you have the offloading features of your network card enabled and/or working.

If you have no idea what I am talking about, you can read more about SNP at the KB article here or the main SNP site here.

Sidenote: Despite the "bad rap" SNP has received during the Windows 2003 SP2 rollout, with properly written and up to date network drivers, it does enhance the network stack quite a bit! It is also, by default, included with Vista and Windows Server 2008.