USB Boot Disk
When you look how to create USB Boot Disk on the web it is a nightmare 
Here is the easiest I use that works for all MS prods
At a computer running Windows Vista, Windows 7, or Windows Server 2008, run a command prompt as administrator and execute the following:
Make Sure you have all explorer windows closed and nothing referencing the USB i.e a doc open in Word
1.
C:\> diskpart
DISKPART> list disk [Identify disk # of the USB key]
DISKPART> sel disk 1 [assuming 1 was the # from above]
DISKPART> clean [CAUTION—will wipe whichever disk is selected]
DISKPART> cre part pri
DISKPART> active
DISKPART> assign
DISKPART> format fs=ntfs quick
DISKPART> exit
C:\> exit
2.
Copy the contents of the Windows Server 2008 R2 or any other MS OS DVD/ISO to the USB key.
3.
From the system tray, use the “Safely remove hardware” icon to safely remove the USB key from the computer. This helps ensure that all files have been fully written to the USB key. (Especially after the large file copy)
4. Restart,,,put usb in and 
Justin Oehlmann
Find reference from HP h20195.www2.hp.com/v2/GetPDF.aspx/4AA3-1317ENW.pdf