Did you try the phone activation ? Many times when I reload windows it will fail the COA but the robot guy on the phone always gets me hooked up.
Hmmm.... One big problem we're running into is that we get OEM machines and reload them with retail disks. We thn try to activate them with the OEM activation key from the sticker on the machine. Sometimes it works, sometimes it doesn't. I'll have to try the phone activation, thanks.