cloning doesn't work

Peepz, I've got exactly the same issue. I am trying to install 3 PCs
for a customer and completely configured one; after that I figured I'd
ghost them to the other machines. However, it hangs at the login
screen, no error call, no nothing. I'm guessing some part of M$
security is griping about new hardware serials, because the hardware
by itself is identical. If anyone knows a quick fix, I'd be much
obliged...