Hi,
I found a GPredict version for windows :)
http://sourceforge.net/projects/gpredict/files/Gpredict/1.1/gpredict-win32-t...
Is is a 7zip file that could be a problem for some, so I placed a zip version in my download area. (Link in the signature, it not a fast link so could take a while if you use that url)
Have fun with this software.
73 Jan - PE0SAT