" SMAC is a MAC Address Modifying Utility (for spoofing MAC address) for Windows 2000, XP, and Server 2003 systems, regardless of whether the manufactures allow this option or not. "
For spoofing MAC addresses, meaning your really not changing anything you just Makking it appear to be differen't reguardless.
I talked to someone whos been with Networking/Computers for over 35 Years has his A+, MCSE and other Microsoft Certs, He said that you cannot change the MAC address on a NIC card. If anyone wants the transcript of our chat I can give it to you.
So I have no idea what Chris is talking about.
But I will do what he said then do an IPconfig/all to prove my MAC address on my Onboard DID NOT change.
Edit: Ok Chris, I did what you said, I changed the Network Address to the Address you provided, it dissconnect me from the internet I then did an "ipconfig/all" in cmd prompt, and lo and behold my Physical address (MAC Address) was the same as the day I got my computer.
So in short, No you cannot change your MAC address like I originally stated, However You can use Programs/Software to "Spoof" it.