Installing 1 W7 image to multiple computers (but with orig. keys)

Why don't you make an image from an un-activated source and then enter the product key when each system is fired up for the first time? That would be the easiest to implement.

You don't have to enter your CD key when prompted to do so during install. Simply click next, configure all your settings, then make your image. Each computer will prompt for the CD key before allowing you to activate.

set one pc up like you want them all to be set up, then sysprep it using the generlize option (this makes it hardware independant) . (also win 7 can only be syspreped 3 times unlike vista xp ect.)
Ghost the image or use a third party imaging software.
load the image on the new pc's

i have found that with oem installs like lenovo and dell when you reload the image has problems (bsod), but the work around is to download an oem verision of win7 from technet and use that one.

as for pulling keys, i dont feel comfortable sharing that info, not sure if it violates tom's tos, but you can google it and find a few options i am sure.

here is a video on how to sysprep Click here

load tha image on the pc.

Did you used the MFG OEM install as the base before installing software? HP uses a special OEM key (not the one on the machine) so you should be OK if all the hardware is identical. Windows should already be activated after imaging. You can use the SLMGR command to deactivate windows and use the key from the MS sticker if you have problems.

http://technet.microsoft.com/library/ff686877.aspx