A fantastic new utility Serva has just been posted on reboot.pro which allows you to quickly and easily set up a PXE server on a Windows PC for WDS and RIS installations very quickly.
You really must try this for yourself!
If you have a DHCP server or home router then this will still work fine as it uses proxyDHCP - you don't need to touch your DHCP server/router!
The download is quite small and it automatically creates the PXE boot menu and the boot images without needing the WAIK!
I have written a breif 'How To' in the Tutorials section of this site - please have a look!
I had a netbook installing Win7 via PXE after just 5 minutes from downloading the utility.
It is also supposed to install the OS very fast (not timed myself so I cannot confirm this).