|I guess it could be done. I never tried it.|
You need some way to boot the system. Then copy the PE files to the hard drive on a small partition. Add in the rest of the disk to another small partition or maybe the same. You'd have to make a boot loader see the PE at boot.
See how to make a windows 7 usb and use those tools to put the data to the hard drive.
I'd also consider borrowing a usb dvd drive or even buy a $4 usb flash to make your install flash drive.
Worse case is to pxe boot to a networked install.
Katy Perry, I'd never treat you badly.