I created an ISO backup of my Dell Win7 Home Premium install disc, and would like to install it from a USB key if possible.

Well, why don't you do it?

I mean WHAT is the question/problem, all you have to do is to make your USB stick bootable and copy the contents of the DVD to it, there are several tutorials available, one for all:

http://technet.microsoft.com/en-us/magazin...a/dd535816.aspx

More:

http://tinyurl.com/yff29ku

Or you can try using this app:

http://www.msfn.org/board/install-usb-wins...ui-t120444.html

If anything does not work, you ask for help.

jaclaz

Edited December 2, 200916 yr by jaclaz