As I have a few days off work, I decided to rebuild my Windows 7 netbook, which led me to find a useful website again. I know a few people have struggled to get Windows 7 onto their computers as netbooks and some laptops don't have DVD drives.
I created a bootable memory stick so that I could install Windows 7 on my Advent 4211 netbook (MSI Wind clone) and have done the same for a few friends who are not so computer literate.
This website gives very good step-by-step instructions on how to do this: http://www.intowindows.com/how-to-install-windows-7vista-from-usb-drive-detailed-100-working-guide/
Bear in mind you will need a Vista or Windows 7 machine in order to create this.