You cant, eSATA doesn't provide any power and is physically incompatible with SATA connectors.
Though if you have a USB handy, you could simply ewrite the windows installation disk on to it and boot from that.
Hmm...I actually have an old usb drive. Will it matter what USB protocall it is? I think it might be USB 1.0. Do you have a recommend link as who to perform this or am I safe using one of the many tutorials you find via google?