The software will run on W7, BUT if you have the 64 bit version, there are no drivers to download/upload to/from your Pronto. Philips decided not to provide 64 bit drivers, so if you have a 32 bit system, you should be okay. If your other OS's are 64 bit, I don't believe they will work either.
Whit I do is make any edits to my configuration on my 64 bit W7, then download it using my 32 bit W7 computer.
Hope this helps.
ps, there are a couple of other threads relating to this, some of which are very angry.