Brand New Mac Pro and Windows7 Messed up.
Partitioned 71G to MAC and 678G to Windows.
Boot Camp Process had a failed error message when creating Boot Disk.
Then No Internet Adapter in Windows.
Cannot get back to MAC OS by holding down Command Key.
I would like to start over but stuck in Windows.
As ReMacs stated, use the option key. Then read the Boot Camp documentation before doing anything else.