Install Windows via BartPE
The nice thing about installing Windows over a network is that you can slipstream your copy with updates, make sure it has all of the drivers necessary and never have to worry about the disk space allotted to your installation media. If you use BartPE or a WinPE disc as your all-in-one utility disc, you can initiate such an installation provided you’ve mapped the network location of your installation media and your destination drive has been formatted (For the example, X is your mapped drive, C is your destination).
X:\i386\Winnt32.exe /Tempdrive:C /Makelocalsource:all /Noreboot /S:”X:\i386”
(Via the repurposed Microsoft KB article 925279.)