If your OS are Windows Enterprise Edition.
You can use the built-in feature "Windows to go"
If you are not,
You can with the help of Aomei Partition Assistant which has a feature of "Windows to go creator"
read more:
http://www.disk-partition.com/features/windows-to-go-creator.html
http://www.microsoft.com/en-us/windows/enterprise/products-and-technologies/devices/windowstogo.aspx
You can use the built-in feature "Windows to go"
If you are not,
You can with the help of Aomei Partition Assistant which has a feature of "Windows to go creator"
read more:
http://www.disk-partition.com/features/windows-to-go-creator.html
http://www.microsoft.com/en-us/windows/enterprise/products-and-technologies/devices/windowstogo.aspx