Hmmm. Sounds like it was being naughty! On my machine, I created a partition for Win 7 and it stayed inside that.
I was impressed with how fast it installed, and how it went off and searched out drivers. It installed in an impressively short time. found the router etc, and called home to validate itself.
Initially, it had a list of peripherals that it didn't know, but after a few minutes on the net, it sorted those.
Everything in the PC is now "Win 7'd" except the SCSI card, and I've got round that.