I'm coming up blank for using the laptop to install windows on the desktop. If you had a usb flash drive it'd be easy...
All I can say is if you're in a rush, Walmart sells drives at reasonable prices and also takes them back <grin> Enjoy!
That's what I ended up doing lol. Amazing really. 4 years ago, my 2 GB USB was $30. Now a 16 GB USB was only $10.