On a 2008R2 lab machine (we have 50 machines) we use the bootoption hypervisorlaunchtype = off to disable hyper-v so we can use vmware, vpc or virtualbox. This works fine but when we use sysprep with an unattend.xml file the bootloader rule is removed and only the OS with Hyper-v can be booted. Any idea how we can script or reset the bootloader?

Hi, You may consider to run a script after the system is setup. Please refer to the following article: http://technet.microsoft.com/en-us/library/cc766314(WS.10).aspx If you would like to know how to write the script, please consult it in our MSDN forum. They are the best resource to deal with scripting issues. http://social.msdn.microsoft.com/Forums/en-US/categories Tim Quan TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

The script we are using is: for /f "tokens=6" %%G in ('bcdedit /copy {default} /d "No Hypervisor"') do set GUID=%%G set GUID=%GUID:~1,-2% bcdedit /set {%GUID%} hypervisorlaunchtype off