Enable AHCI booting and sync Win2008-32 unattended file format

As NT 6.X OS has a limitation that install on non-AHCI hard drive
would result further booting on AHCI BSOD, this is the solution
to fix, per http://support.microsoft.com/kb/922976
and found that Win2008-32 lacks some cmd to update registry(64 has)
so sync it to same as 64bits, replaced some cmd(software install).

Signed-off-by: Xiaoqing Wei <xwei@redhat.com>