I restarted the tftpd-hpa service on the FOG machine, and I am now able to tftp the undionly.kpxe file inside a windows machine. Yay!
BUT, when I attempted to PXE boot the client machine (the HP Elitebook), the F8 menu timed out super-fast (as it had before).
Jaymes, I have started a download from cisco.com of the cna of which you speak. You may have opened a door to a whole new world for me:)
I will hopefully use it to check my switches for Port Fast functionality.