[CentOS-virt] win2008r2 update on centos 6 host made system unbootable

[Dennis Jacobfeuerborn]

Hi,
today we ran into a strange problem: When performing a regular Windows
2008r2 update apparently among other things the following was installed:
"SUSE - Storage Controller - SUSE Block Driver for Windows"

Previously the disk drive was using the Red Hat virtio drivers which
worked just fine but after the reboot after the update I just get a blue
screen indicating that Windows cannot find a boot device.

Does anyone understand what is going on here? Why is the windows update
installing a Suse driver that overrides the Red Hat driver even though
it is apparently incompatible with the system?

Regards,
  Dennis