Here you'll find a couple of TFTP servers out there.
This one from Solarwinds is a large one with alot more functionality then most. (overkill maybe)
http://www.solarwinds.com/products/free ... erver.aspx

Or if you want something light weight, then try this:
http://www.cccommunications.com.au/soft ... 32.332.zip

If you know of any others then please hit me up and i'll add them.